build(deps): 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>

.github/workflows/ogc.yml

@@ -44,7 +44,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Restore build cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: /home/runner/QGIS/.ccache
           key: build-ccache-ogc-${{ github.event.pull_request.base.ref || github.ref_name }}
@@ -72,7 +72,7 @@ jobs:
           DOCKER_IMAGE: ${{ steps.docker-build.outputs.imageid }}
 
       - name: Save build cache for push only
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
         if: ${{ github.event_name == 'push' }}
         with:
           path: /home/runner/QGIS/.ccache