build(deps): bump docker/metadata-action from 3 to 4 (#153)

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 3 to 4.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Upgrade guide](https://github.com/docker/metadata-action/blob/master/UPGRADE.md)
- [Commits](docker/metadata-action@v3...v4)

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

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

.github/workflows/build.yaml

@@ -33,7 +33,7 @@ jobs:
       - run: echo '::set-output name=GIT_DESCRIBE::'`git describe --tags --always --long`
         name: Run `git describe` and save its output
         id: git-describe
-      - uses: docker/metadata-action@v3
+      - uses: docker/metadata-action@v4
         name: Calculate metadata for alpine-flavored Docker images
         id: meta-alpine
         with:
@@ -52,7 +52,7 @@ jobs:
           platforms: ${{ env.platforms }}
           tags: ${{ steps.meta-alpine.outputs.tags }}
           labels: ${{ steps.meta-alpine.outputs.labels }}
-      - uses: docker/metadata-action@v3
+      - uses: docker/metadata-action@v4
         name: Calculate metadata for minimal Docker images
         id: meta-minimal
         with: