fix(starlark): add List to typing imports for schema parser

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

plugin-repos/starlark-apps/pixlet_renderer.py

@@ -13,7 +13,7 @@ import re
 import shutil
 import subprocess
 from pathlib import Path
-from typing import Dict, Any, Optional, Tuple
+from typing import Dict, Any, Optional, Tuple, List
 
 logger = logging.getLogger(__name__)