CI: bump actions/cache from 3 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](https://github.com/actions/cache/compare/v3...v4)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Closes #12756

.github/workflows/ngtcp2-linux.yml

@@ -94,7 +94,7 @@ jobs:
         name: 'install prereqs and impacket, pytest, crypto, apache2'
 
       - name: cache quictls
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: cache-quictls-no-deprecated
         env:
           cache-name: cache-quictls-no-deprecated
@@ -118,7 +118,7 @@ jobs:
 
 
       - name: cache gnutls
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: cache-gnutls
         env:
           cache-name: cache-gnutls
@@ -146,7 +146,7 @@ jobs:
 
 
       - name: cache wolfssl
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: cache-wolfssl
         env:
           cache-name: cache-wolfssl
@@ -172,7 +172,7 @@ jobs:
 
 
       - name: cache nghttp3
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: cache-nghttp3
         env:
           cache-name: cache-nghttp3
@@ -214,7 +214,7 @@ jobs:
         name: 'install nghttp2'
 
       - name: cache mod_h2
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: cache-mod_h2
         env:
           cache-name: cache-mod_h2