Bump actions/cache from 4 to 5 (#70)

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](actions/cache@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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
                 submodules: true
 
           - name: Reuse ccache directory
-            uses: actions/cache@v4
+            uses: actions/cache@v5
             with:
                 path: ~/.cache/ccache
                 key: '${{matrix.os}} ${{matrix.info}} ccache-dir ${{github.ref}} run-${{github.run_number}}'

.github/workflows/docker.yaml

@@ -19,7 +19,7 @@ jobs:
                 submodules: true
 
           - name: Reuse ccache directory
-            uses: actions/cache@v4
+            uses: actions/cache@v5
             with:
                 path: .ccache
                 key: 'ccache-dir-${{github.ref}}_run-${{github.run_number}}'