build(deps): bump docker/build-push-action from 2 to 4

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.yml

@@ -27,7 +27,7 @@ jobs:
         uses: docker/setup-buildx-action@v1
       -
         name: Build and export to Docker
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v4
         with:
           context: .
           load: true
@@ -82,7 +82,7 @@ jobs:
       -
         name: Build and push
         if: github.event_name == 'push'
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v4
         with:
           context: .
           platforms: linux/amd64,linux/arm64