Update sentry_sdk/ai/utils.py

Co-authored-by: Alex Alderman Webb <alexander.webb@sentry.io>

Author: constantinius

sentry_sdk/ai/utils.py

@@ -217,7 +217,7 @@ def redact_blob_message_parts(
         if isinstance(content, list):
             for item in content:
                 if isinstance(item, dict) and item.get("type") == "blob":
-                    item["content"] = SENSITIVE_DATA_SUBSTITUTE
+                    item["content"] = BLOB_DATA_SUBSTITUTE
 
     return messages_copy