Bump actions/cache from 4 to 5

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 5.
- [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/v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/ci.yml

@@ -63,7 +63,7 @@ jobs:
       - name: Restore Git cache
         if: matrix.git-version != 'latest'
         id: cache-git-restore
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         with:
           path: ~/git-${{matrix.git-version}}
           key: ${{runner.os}}-git-${{matrix.git-version}}
@@ -80,7 +80,7 @@ jobs:
         run: sudo make -C "$HOME/git-${{matrix.git-version}}" -j install
       - name: Save Git cache
         if: steps.cache-git-restore.outputs.cache-hit != 'true' && matrix.git-version != 'latest'
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         with:
           path: ~/git-${{matrix.git-version}}
           key: ${{runner.os}}-git-${{matrix.git-version}}