build(deps): bump actions/cache from 2.1.6 to 2.1.7 (#7347)

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.6 to 2.1.7.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@c64c572...937d244)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/release.yml

@@ -84,7 +84,7 @@ jobs:
         echo "TAG=$(CI_FORCE_CLEAN=1 bin/root-tag)" >> $GITHUB_ENV
         echo "DOCKER_BUILDKIT_CACHE=${{ runner.temp }}/.buildx-cache" >> $GITHUB_ENV
     - name: Cache docker layers
-      uses: actions/cache@c64c572235d810460d0d6876e9c705ad5002b353
+      uses: actions/cache@937d24475381cd9c75ae6db12cb4e79714b926ed
       with:
         path: ${{ env.DOCKER_BUILDKIT_CACHE }}
         key: policy-controller-${{ matrix.arch }}-${{ env.TAG }}