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] <[email protected]>

Author: dependabot[bot]

.github/workflows/ghcr.yaml

@@ -39,7 +39,7 @@ jobs:
           tags: |
             type=semver,pattern={{version}},value=v${{steps.set_version.outputs.no-dash}}
             type=raw,value=latest
-      - uses: docker/build-push-action@v5
+      - uses: docker/build-push-action@v6
         with:
           push: true
           context: .