ci: bump docker/bake-action from 5 to 6

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

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

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

.github/workflows/docker.yaml

@@ -140,7 +140,7 @@ jobs:
           password: ${{ secrets.REGISTRY_PASSWORD }}
       - name: Build
         id: build
-        uses: docker/bake-action@v5
+        uses: docker/bake-action@v6
         with:
           pull: true
           load: ${{ !fromJson(needs.prepare.outputs.push) }}