Bump docker/build-push-action from 2 to 4 in /.github/workflows

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](https://github.com/docker/build-push-action/compare/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] <support@github.com>

.github/workflows/docker-pr.yml

@@ -28,7 +28,7 @@ jobs:
       - name: setup multi-arch docker build
         uses: docker/setup-buildx-action@v1
       - name: build & push images
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v4
         with:
           context: .
           file: ./Dockerfile

.github/workflows/docker-release.yml

@@ -76,7 +76,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: build & push images
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v4
         with:
           context: .
           file: ./Dockerfile

.github/workflows/docker.yml

@@ -76,7 +76,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: build & push images
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v4
         with:
           context: .
           file: ./Dockerfile