Fix another UUID cast

Author: tulir

github/db.py

@@ -80,7 +80,7 @@ def from_row(cls, row: Record | None) -> Optional["WebhookInfo"]:
         github_id = row["github_id"]
         secret = row["secret"]
         return cls(
-            id=uuid.UUID(id),
+            id=id if isinstance(id, uuid.UUID) else uuid.UUID(id),
             repo=repo,
             user_id=user_id,
             room_id=room_id,