Unskip test_timestamp_overflow

Lib/test/test_importlib/source/test_file_loader.py

@@ -192,7 +192,6 @@ class SimpleTest(abc.LoaderTests):
             if os.path.exists(pycache):
                 shutil.rmtree(pycache)
 
-    @unittest.skip("TODO: RUSTPYTHON")
     @util.writes_bytecode_files
     def test_timestamp_overflow(self):
         # When a modification timestamp is larger than 2**32, it should be