Use stricter pyright settings for gunicorn (#14771)

Author: AlexWaygood

pyrightconfig.stricter.json

@@ -44,7 +44,6 @@
         "stubs/grpcio-reflection/grpc_reflection/v1alpha",
         "stubs/grpcio-status/grpc_status",
         "stubs/grpcio/grpc/__init__.pyi",
-        "stubs/gunicorn",
         "stubs/hdbcli/hdbcli/dbapi.pyi",
         "stubs/html5lib",
         "stubs/httplib2",