GR-9143: revert urllib.error patch

Author: cosminbasca

graalpython/lib-python/3/test/support/__init__.py

@@ -31,8 +31,7 @@
 import time
 import types
 import unittest
-# TODO: Truffle reenable me once supported (GR-9143)
-# import urllib.error
+import urllib.error
 import warnings