Use assertEqual() instead of assertEquals(). (GH-9721) (GH-9725) (GH-9727)

Fixes warnings in test added in bpo-34603.
(cherry picked from commit 4642d5f)
(cherry picked from commit 6bffe50)

Author: miss-islington

Lib/ctypes/test/test_win32.py

@@ -68,7 +68,7 @@ class S(Structure):
             for i, f in enumerate(fields):
                 value = getattr(res, f[0])
                 expected = bytes([ord('a') + i])
-                self.assertEquals(value, expected)
+                self.assertEqual(value, expected)