Remove subTest again

Author: sobolevn

Lib/test/test_zoneinfo/test_zoneinfo_property.py

@@ -147,11 +147,10 @@ def setUp(self):
     def test_pickle_unpickle_cache(self, key):
         zi = self.klass(key)
         for proto in range(pickle.HIGHEST_PROTOCOL + 1):
-            with self.subTest(proto=proto):
-                pkl_str = pickle.dumps(zi, proto)
-                zi_rt = pickle.loads(pkl_str)
+            pkl_str = pickle.dumps(zi, proto)
+            zi_rt = pickle.loads(pkl_str)
 
-                self.assertIs(zi, zi_rt)
+            self.assertIs(zi, zi_rt)
 
     @hypothesis.given(key=valid_keys())
     @add_key_examples