drop VERSION property for cmake <3.19 compatibility

```
-- Found Libpsl: /usr/local/include (found version "0.21.5")
CMake Error at CMake/FindLibpsl.cmake:90 (set_target_properties):
  INTERFACE_LIBRARY targets may only have whitelisted properties.  The
  property "VERSION" is not allowed.
Call Stack (most recent call first):
  CMakeLists.txt:1252 (find_package)
```

CMake/FindBrotli.cmake

@@ -80,7 +80,6 @@ if(BROTLI_FOUND)
   if(NOT TARGET CURL::brotli)
     add_library(CURL::brotli INTERFACE IMPORTED)
     set_target_properties(CURL::brotli PROPERTIES
-      VERSION "${BROTLI_VERSION}"
       CURL_PC_MODULES "${_brotli_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_brotli_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_brotli_INCLUDE_DIRS}"

CMake/FindCares.cmake

@@ -102,7 +102,6 @@ if(CARES_FOUND)
   if(NOT TARGET CURL::cares)
     add_library(CURL::cares INTERFACE IMPORTED)
     set_target_properties(CURL::cares PROPERTIES
-      VERSION "${CARES_VERSION}"
       CURL_PC_MODULES "${_cares_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_cares_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_cares_INCLUDE_DIRS}"

CMake/FindGSS.cmake

@@ -269,7 +269,6 @@ if(GSS_FOUND)
 
     add_library(CURL::gss INTERFACE IMPORTED)
     set_target_properties(CURL::gss PROPERTIES
-      VERSION "${GSS_VERSION}"
       CURL_PC_MODULES "${_gss_pc_requires}"
       CURL_GSS_FLAVOUR "${_gss_flavour}"
       INTERFACE_COMPILE_OPTIONS "${_gss_CFLAGS}"

CMake/FindLDAP.cmake

@@ -111,7 +111,6 @@ if(LDAP_FOUND)
   if(NOT TARGET CURL::ldap)
     add_library(CURL::ldap INTERFACE IMPORTED)
     set_target_properties(CURL::ldap PROPERTIES
-      VERSION "${LDAP_VERSION}"
       CURL_PC_MODULES "${_ldap_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_ldap_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_ldap_INCLUDE_DIRS}"

CMake/FindLibgsasl.cmake

@@ -87,7 +87,6 @@ if(LIBGSASL_FOUND)
   if(NOT TARGET CURL::libgsasl)
     add_library(CURL::libgsasl INTERFACE IMPORTED)
     set_target_properties(CURL::libgsasl PROPERTIES
-      VERSION "${LIBGSASL_VERSION}"
       CURL_PC_MODULES "${_libgsasl_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_libgsasl_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_libgsasl_INCLUDE_DIRS}"

CMake/FindLibidn2.cmake

@@ -88,7 +88,6 @@ if(LIBIDN2_FOUND)
   if(NOT TARGET CURL::libidn2)
     add_library(CURL::libidn2 INTERFACE IMPORTED)
     set_target_properties(CURL::libidn2 PROPERTIES
-      VERSION "${LIBIDN2_VERSION}"
       CURL_PC_MODULES "${_libidn2_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_libidn2_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_libidn2_INCLUDE_DIRS}"

CMake/FindLibpsl.cmake

@@ -88,7 +88,6 @@ if(LIBPSL_FOUND)
   if(NOT TARGET CURL::libpsl)
     add_library(CURL::libpsl INTERFACE IMPORTED)
     set_target_properties(CURL::libpsl PROPERTIES
-      VERSION "${LIBPSL_VERSION}"
       CURL_PC_MODULES "${_libpsl_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_libpsl_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_libpsl_INCLUDE_DIRS}"

CMake/FindLibrtmp.cmake

@@ -108,7 +108,6 @@ if(LIBRTMP_FOUND)
   if(NOT TARGET CURL::librtmp)
     add_library(CURL::librtmp INTERFACE IMPORTED)
     set_target_properties(CURL::librtmp PROPERTIES
-      VERSION "${LIBRTMP_VERSION}"
       CURL_PC_MODULES "${_librtmp_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_librtmp_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_librtmp_INCLUDE_DIRS}"

CMake/FindLibssh.cmake

@@ -102,7 +102,6 @@ if(LIBSSH_FOUND)
   if(NOT TARGET CURL::libssh)
     add_library(CURL::libssh INTERFACE IMPORTED)
     set_target_properties(CURL::libssh PROPERTIES
-      VERSION "${LIBSSH_VERSION}"
       CURL_PC_MODULES "${_libssh_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_libssh_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_libssh_INCLUDE_DIRS}"

CMake/FindLibssh2.cmake

@@ -88,7 +88,6 @@ if(LIBSSH2_FOUND)
   if(NOT TARGET CURL::libssh2)
     add_library(CURL::libssh2 INTERFACE IMPORTED)
     set_target_properties(CURL::libssh2 PROPERTIES
-      VERSION "${LIBSSH2_VERSION}"
       CURL_PC_MODULES "${_libssh2_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_libssh2_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_libssh2_INCLUDE_DIRS}"

CMake/FindMbedTLS.cmake

@@ -104,7 +104,6 @@ if(MBEDTLS_FOUND)
   if(NOT TARGET CURL::mbedtls)
     add_library(CURL::mbedtls INTERFACE IMPORTED)
     set_target_properties(CURL::mbedtls PROPERTIES
-      VERSION "${MBEDTLS_VERSION}"
       CURL_PC_MODULES "${_mbedtls_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_mbedtls_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_mbedtls_INCLUDE_DIRS}"

CMake/FindNGHTTP2.cmake

@@ -87,7 +87,6 @@ if(NGHTTP2_FOUND)
   if(NOT TARGET CURL::nghttp2)
     add_library(CURL::nghttp2 INTERFACE IMPORTED)
     set_target_properties(CURL::nghttp2 PROPERTIES
-      VERSION "${NGHTTP2_VERSION}"
       CURL_PC_MODULES "${_nghttp2_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_nghttp2_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_nghttp2_INCLUDE_DIRS}"

CMake/FindNGHTTP3.cmake

@@ -87,7 +87,6 @@ if(NGHTTP3_FOUND)
   if(NOT TARGET CURL::nghttp3)
     add_library(CURL::nghttp3 INTERFACE IMPORTED)
     set_target_properties(CURL::nghttp3 PROPERTIES
-      VERSION "${NGHTTP3_VERSION}"
       CURL_PC_MODULES "${_nghttp3_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_nghttp3_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_nghttp3_INCLUDE_DIRS}"

CMake/FindNGTCP2.cmake

@@ -145,7 +145,6 @@ if(NGTCP2_FOUND)
   if(NOT TARGET CURL::ngtcp2)
     add_library(CURL::ngtcp2 INTERFACE IMPORTED)
     set_target_properties(CURL::ngtcp2 PROPERTIES
-      VERSION "${NGTCP2_VERSION}"
       CURL_PC_MODULES "${_ngtcp2_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_ngtcp2_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_ngtcp2_INCLUDE_DIRS}"

CMake/FindNettle.cmake

@@ -93,7 +93,6 @@ if(NETTLE_FOUND)
   if(NOT TARGET CURL::nettle)
     add_library(CURL::nettle INTERFACE IMPORTED)
     set_target_properties(CURL::nettle PROPERTIES
-      VERSION "${NETTLE_VERSION}"
       CURL_PC_MODULES "${_nettle_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_nettle_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_nettle_INCLUDE_DIRS}"

CMake/FindQuiche.cmake

@@ -76,7 +76,6 @@ if(QUICHE_FOUND)
   if(NOT TARGET CURL::quiche)
     add_library(CURL::quiche INTERFACE IMPORTED)
     set_target_properties(CURL::quiche PROPERTIES
-      VERSION "${QUICHE_VERSION}"
       CURL_PC_MODULES "${_quiche_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_quiche_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_quiche_INCLUDE_DIRS}"

CMake/FindRustls.cmake

@@ -114,7 +114,6 @@ if(RUSTLS_FOUND)
   if(NOT TARGET CURL::rustls)
     add_library(CURL::rustls INTERFACE IMPORTED)
     set_target_properties(CURL::rustls PROPERTIES
-      VERSION "${RUSTLS_VERSION}"
       CURL_PC_MODULES "${_rustls_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_rustls_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_rustls_INCLUDE_DIRS}"

CMake/FindWolfSSL.cmake

@@ -119,7 +119,6 @@ if(WOLFSSL_FOUND)
   if(NOT TARGET CURL::wolfssl)
     add_library(CURL::wolfssl INTERFACE IMPORTED)
     set_target_properties(CURL::wolfssl PROPERTIES
-      VERSION "${WOLFSSL_VERSION}"
       CURL_PC_MODULES "${_wolfssl_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_wolfssl_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_wolfssl_INCLUDE_DIRS}"

CMake/FindZstd.cmake

@@ -107,7 +107,6 @@ if(ZSTD_FOUND)
   if(NOT TARGET CURL::zstd)
     add_library(CURL::zstd INTERFACE IMPORTED)
     set_target_properties(CURL::zstd PROPERTIES
-      VERSION "${ZSTD_VERSION}"
       CURL_PC_MODULES "${_zstd_pc_requires}"
       INTERFACE_COMPILE_OPTIONS "${_zstd_CFLAGS}"
       INTERFACE_INCLUDE_DIRECTORIES "${_zstd_INCLUDE_DIRS}"