use 6.0-noble for format check

Author: sebsto

.github/workflows/pull_request.yml

@@ -14,7 +14,7 @@ jobs:
       python_lint_check_enabled: false
       api_breakage_check_container_image: "swift:6.0-noble"
       docs_check_container_image: "swift:6.0-noble"
-      format_check_container_image: "swiftlang/swift:nightly-6.0-jammy"
+      format_check_container_image: "swift:6.0-noble"
 
   unit-tests:
     name: Unit tests