Issue #19758: silence PendingDeprecationWarnings in test_importlib.

Lib/test/test_importlib/test_spec.py

@@ -10,6 +10,7 @@ import os.path
 from test.support import CleanImport
 import unittest
 import sys
+import warnings
 
 
 
@@ -55,6 +56,9 @@ class LegacyLoader(TestLoader):
 
     HAM = -1
 
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore", PendingDeprecationWarning)
+
         @frozen_util.module_for_loader
         def load_module(self, module):
             module.ham = self.HAM