tidy-up: miscellaneous

- cmake/Find*: make double quotes consistent.
- drop redundant parenthesis.
- GHA/checksrc: sync a step name with others.
- whitespace.

Closes #19233

CMake/FindBrotli.cmake

@@ -51,7 +51,7 @@ endif()
 
 if(BROTLI_FOUND)
   set(Brotli_FOUND TRUE)
-  set(BROTLI_VERSION "${BROTLI_libbrotlicommon_VERSION}")
+  set(BROTLI_VERSION ${BROTLI_libbrotlicommon_VERSION})
   string(REPLACE ";" " " BROTLI_CFLAGS "${BROTLI_CFLAGS}")
   message(STATUS "Found Brotli (via pkg-config): ${BROTLI_INCLUDE_DIRS} (found version \"${BROTLI_VERSION}\")")
 else()

CMake/FindLDAP.cmake

@@ -50,7 +50,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(LDAP_FOUND)
-  set(LDAP_VERSION "${LDAP_ldap_VERSION}")
+  set(LDAP_VERSION ${LDAP_ldap_VERSION})
   string(REPLACE ";" " " LDAP_CFLAGS "${LDAP_CFLAGS}")
   message(STATUS "Found LDAP (via pkg-config): ${LDAP_INCLUDE_DIRS} (found version \"${LDAP_VERSION}\")")
 else()

CMake/FindMbedTLS.cmake

@@ -59,7 +59,7 @@ endif()
 
 if(MBEDTLS_FOUND)
   set(MbedTLS_FOUND TRUE)
-  set(MBEDTLS_VERSION "${MBEDTLS_mbedtls_VERSION}")
+  set(MBEDTLS_VERSION ${MBEDTLS_mbedtls_VERSION})
   string(REPLACE ";" " " MBEDTLS_CFLAGS "${MBEDTLS_CFLAGS}")
   message(STATUS "Found MbedTLS (via pkg-config): ${MBEDTLS_INCLUDE_DIRS} (found version \"${MBEDTLS_VERSION}\")")
 else()

CMake/FindNGTCP2.cmake

@@ -86,7 +86,7 @@ if(CURL_USE_PKGCONFIG AND
 endif()
 
 if(NGTCP2_FOUND)
-  set(NGTCP2_VERSION "${NGTCP2_libngtcp2_VERSION}")
+  set(NGTCP2_VERSION ${NGTCP2_libngtcp2_VERSION})
   string(REPLACE ";" " " NGTCP2_CFLAGS "${NGTCP2_CFLAGS}")
   message(STATUS "Found NGTCP2 (via pkg-config): ${NGTCP2_INCLUDE_DIRS} (found version \"${NGTCP2_VERSION}\")")
 else()