Bump docker/build-push-action from 5.3.0 to 6.0.0 (#298)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5.3.0 to 6.0.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@2cdde99...c382f71)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -68,7 +68,7 @@ jobs:
         uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb # v3.3.0
 
       - name: Build Plus Docker Image
-        uses: docker/build-push-action@2cdde995de11925a030ce8070c3d77a52ffcf1c0 # v5.3.0
+        uses: docker/build-push-action@c382f710d39a5bb4e430307530a720f50c2d3318 # v6.0.0
         with:
           file: docker/Dockerfile
           tags: nginx-plus