Bump docker/build-push-action from 4 to 6

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 4 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v4...v6)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build-publish.yml

@@ -64,7 +64,7 @@ jobs:
       -
         name: Build and push - FrankenPHP D11
         id: docker_build_frankenphp_11
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         continue-on-error: true
         with:
           context: ./frankenphp/