Bump docker/build-push-action from 3 to 4

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 3 to 4.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v3...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/test-and-build-v6.yml

@@ -63,7 +63,7 @@ jobs:
 
       - name: Build container and push by digest (${{ matrix.registry }})
         id: build
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v4
         with:
           context: ./src/
           platforms: ${{ matrix.platform }}