ghactions: bump docker/metadata-action from 3.3.0 to 3.6.2

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 3.3.0 to 3.6.2.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](docker/metadata-action@98669ae...e562237)

---
updated-dependencies:
- dependency-name: docker/metadata-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/backup-operator-docker.yml

@@ -38,7 +38,7 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - id: meta                   # Used to pass data into next step
-        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        uses: docker/metadata-action@e5622373a38e60fb6d795a4421e56882f2d7a681
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
       - uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc