gh-146325: Use test.support.requires_fork in test_fastpath_cache_cleared_in_forked_child

Tests that need fork have to call test.support.requires_fork() to rule out
platforms that have `os.fork()` but where it should not be called

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,
@@ -53,11 +53,7 @@ def test_one_distribution(self):
         assert len(dists) == 1
 
     @warnings_helper.ignore_fork_in_thread_deprecation_warnings()
-    @unittest.skipUnless(
-        hasattr(os, 'register_at_fork')
-        and 'fork' in multiprocessing.get_all_start_methods(),
-        'requires fork-based multiprocessing support',
-    )
+    @requires_fork()
     def test_fastpath_cache_cleared_in_forked_child(self):
         zip_path = sys.path[0]