Use sha256 for component analysis cache key

Author: owenisas

backend/lambda_handler.py

@@ -4899,7 +4899,7 @@ def _build_component_analysis_id(
     instruction: str,
     component_data_json: str,
 ) -> str:
-    digest = hashlib.sha1(
+    digest = hashlib.sha256(
         f"{source_block_id}|{component_type}|{action}|{instruction}|{component_data_json}".encode("utf-8")
     ).hexdigest()
     return f"analysis_{digest[:20]}"