Restore stubtest 0.930 (#6663)

stdlib/unittest/loader.pyi

@@ -3,11 +3,13 @@ import unittest.case
 import unittest.result
 import unittest.suite
 from types import ModuleType
-from typing import Any, Callable, List, Sequence, Type
+from typing import Any, Callable, List, Pattern, Sequence, Type
 
 _SortComparisonMethod = Callable[[str, str], int]
 _SuiteClass = Callable[[List[unittest.case.TestCase]], unittest.suite.TestSuite]
 
+VALID_MODULE_NAME: Pattern[str]
+
 class TestLoader:
     errors: list[Type[BaseException]]
     testMethodPrefix: str