Fix type annotations

Author: colesbury

Lib/test/libregrtest/parallel_case.py

@@ -18,7 +18,7 @@ def __init__(self, test_case: TestCase, num_threads: int):
     def __str__(self):
         return f"{str(self.test_case)} [threads={self.num_threads}]"
 
-    def run_worker(self, test_case: TestCase, result: unittest.Result,
+    def run_worker(self, test_case: TestCase, result: unittest.TestResult,
                    barrier: threading.Barrier):
         barrier.wait()
         test_case.run(result)

Lib/test/libregrtest/single.py

@@ -60,7 +60,7 @@ def is_thread_unsafe(test):
         return (getattr(test_method, "__unittest_thread_unsafe__", False) or
                 getattr(instance, "__unittest_thread_unsafe__", False))
 
-    newtests = []
+    newtests: list[object] = []
     for test in suite._tests:
         if isinstance(test, unittest.TestSuite):
             _parallelize_tests(test, parallel_threads)