Bump docker/build-push-action from 5 to 6

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5...v6)

---
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>

Author: dependabot[bot]

.github/workflows/docker.yml

@@ -29,15 +29,15 @@ jobs:
 
       - name: Sync - Build and push
         id: docker_build_sync
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           file: ./vscoffline/vscsync/Dockerfile          
           tags: lolinternet/vscsync:latest,lolinternet/vscsync:${{ steps.get_version.outputs.version-without-v }}
           push: true
 
       - name: Sync - Build and push
         id: docker_build_gallery
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           file: ./vscoffline/vscgallery/Dockerfile
           tags: lolinternet/vscgallery:latest,lolinternet/vscgallery:${{ steps.get_version.outputs.version-without-v }}