Bump docker/build-push-action from 5 to 6 in the gha-dependencies group

Bumps the gha-dependencies group with 1 update: [docker/build-push-action](https://github.com/docker/build-push-action).


Updates `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
  dependency-group: gha-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/docker.yml

@@ -42,7 +42,7 @@ jobs:
 
             - name: Build image
               id: build
-              uses: docker/build-push-action@v5
+              uses: docker/build-push-action@v6
               with:
                   tags: ${{ env.REGISTRY }}${{ env.ISPG_IMAGE }}
                   cache-from: type=gha