fix init file

Author: ohmayr

gapic/utils/__init__.py

@@ -35,7 +35,8 @@
 
 __all__ = (
     "cached_property",
-    "cached_proto_context" "convert_uri_fieldnames",
+    "cached_proto_context",
+    "convert_uri_fieldnames",
     "doc",
     "empty",
     "is_msg_field_pb",