Bump docker/build-push-action from 2 to 4 (#101)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2 to 4.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v2...v4)

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

.github/workflows/docker.yaml

@@ -59,7 +59,7 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
       - name: Build
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v4
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: .