chore(deps): update docker/build-push-action action to v6

Author: renovate[bot]

.github/workflows/update-docker-images.yml

@@ -34,7 +34,7 @@ jobs:
           registry: ghcr.io
           username: ${{github.repository_owner}}
           password: ${{secrets.GITHUB_TOKEN}}
-      - uses: docker/build-push-action@v5
+      - uses: docker/build-push-action@v6
         with:
           context: test
           file: test/docker/${{matrix.dist}}/Dockerfile