Change back the class name

Author: LamentXU123

Lib/test/test_uuid.py

@@ -1141,7 +1141,7 @@ def test_uuid_weakref(self):
         self.assertIs(strong, weak())
 
 
-class TestUUIDCommandLineRunTimeMixin:
+class CommandLineRunTime:
     def do_test_standalone_uuid(self, version):
         stdout = io.StringIO()
         with contextlib.redirect_stdout(stdout):