pythongh-146325: Use test.support.requires_fork in test_fastpath_cache_cleared_in_forked_child (python#146330)

Author: hoodmane

Lib/test/test_importlib/metadata/test_zip.py

@@ -3,7 +3,7 @@
 import sys
 import unittest
 
-from test.support import warnings_helper
+from test.support import requires_fork, warnings_helper
 
 from importlib.metadata import (
     FastPath,
@@ -53,6 +53,7 @@ def test_one_distribution(self):
         assert len(dists) == 1
 
     @warnings_helper.ignore_fork_in_thread_deprecation_warnings()
+    @requires_fork()
     @unittest.skipUnless(
         hasattr(os, 'register_at_fork')
         and 'fork' in multiprocessing.get_all_start_methods(),