Bump docker/build-push-action from 4.1.1 to 4.2.1

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 4.1.1 to 4.2.1.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v4.1.1...v4.2.1)

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

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

.github/workflows/docker-release.yml

@@ -55,15 +55,15 @@ jobs:
           echo ::set-output name=version::${VERSION}
       -
         name: "Docker: Buildx Build"
-        uses: docker/build-push-action@v4.1.1
+        uses: docker/build-push-action@v4.2.1
         with:
           platforms: ${{ steps.prepare.outputs.platforms }}
           push: false
           tags: ${{ steps.prepare.outputs.tags }}
           build-args: ${{ steps.prepare.outputs.args }}
       -
         name: "Docker: Load Image"
-        uses: docker/build-push-action@v4.1.1
+        uses: docker/build-push-action@v4.2.1
         with:
           load: true
           push: false
@@ -93,7 +93,7 @@ jobs:
       -
         name: "Docker: Buildx Push"
         if: success() && github.event_name != 'pull_request'
-        uses: docker/build-push-action@v4.1.1
+        uses: docker/build-push-action@v4.2.1
         with:
           platforms: ${{ steps.prepare.outputs.platforms }}
           push: true