Apply suggestion from @vstinner

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: FFY00

Lib/test/test_importlib/test_discover.py

@@ -11,7 +11,7 @@ def __init__(self, discover=[]):
         self._discovered_values = discover
 
     def find_spec(self, fullname, path=None, target=None):
-        raise NotImplementedError()
+        raise NotImplementedError
 
     def discover(self, parent=None):
         yield from self._discovered_values