Skip tests that cause RustPython to hang.

Lib/test/lock_tests.py

@@ -161,6 +161,7 @@ class BaseLockTests(BaseTestCase):
         # Check the lock is unacquired
         Bunch(f, 1).wait_for_finished()
 
+    @unittest.skip("TODO: RUSTPYTHON, sometimes hangs")
     def test_thread_leak(self):
         # The lock shouldn't leak a Thread instance when used from a foreign
         # (non-threading) thread.