chore(deps): bump docker/metadata-action from 3 to 3.1.0 (#14)

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 3 to 3.1.0.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](https://github.com/docker/metadata-action/compare/v3...v3.1.0)

Signed-off-by: dependabot[bot] <[email protected]>

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

.github/workflows/docker-image-push.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/[email protected]
       - name: Docker meta
         id: docker_meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v3.1.0
         with:
           images: wernerfred/docker-rainloop
           tags: |