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/desktop-build.yml

@@ -166,7 +166,7 @@ jobs:
 
       - name: Restore compiler cache (ccache)
         id: ccache_restore
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         env:
           BRANCH_NAME: ${{ github.head_ref || github.ref_name }}
         with:
@@ -205,7 +205,7 @@ jobs:
 
       - name: Save compiler cache (ccache)
         if: github.ref == 'refs/heads/master'
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         with:
           path: ${{env.CACHE}}
           key: ${{ steps.ccache_restore.outputs.cache-primary-key }}