bpo-40029 mark test_importlib.test_zip as requiring zlib (#19105)

* bpo-40029 mark test_importlib.test_zip as requiring zlib

* Decorate TestZip / TestEgg classes as requiring zlib

Lib/test/test_importlib/test_zip.py

@@ -7,7 +7,10 @@ from importlib.metadata import (
 )
 from importlib.resources import path
 
+from test.support import requires_zlib
 
+
+@requires_zlib
 class TestZip(unittest.TestCase):
     root = 'test.test_importlib.data'
 
@@ -47,6 +50,7 @@ class TestZip(unittest.TestCase):
             assert '.whl/' in path, path
 
 
+@requires_zlib
 class TestEgg(TestZip):
     def setUp(self):
         # Find the path to the example-*.egg so we can add it to the front of