Bump docker/metadata-action from 3 to 3.1.0

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](docker/metadata-action@v3...v3.1.0)

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

.github/workflows/bakebuild.yml

@@ -20,7 +20,7 @@ jobs:
       -  
         name: Docker meta
         id: docker_meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v3.1.0
         with:
           images: |
             ${{ env.DOCKERHUB_SLUG }}