build(deps): bump docker/build-push-action from 3.2.0 to 4.2.1

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 3.2.0 to 4.2.1.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@c56af95...0a97817)

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

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

.github/workflows/build-containers.yml

@@ -106,7 +106,7 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build & Deploy ${{ matrix.dockerfile[0] }}
-        uses: docker/build-push-action@c56af957549030174b10d6867f20e78cfd7debc5 # @v2
+        uses: docker/build-push-action@0a97817b6ade9f46837855d676c4cca3a2471fc9 # @v2
         with:
           context: dockerfiles/${{ matrix.dockerfile[0] }}
           platforms: ${{ matrix.dockerfile[1] }}