bpo-40421: test_capi uses assertEqual(), not assertEquals() (GH-32361)

unittest.TestCase.assertEquals() alias is depracated. Fix the
warning:

Lib/test/test_capi.py:1100: DeprecationWarning: Please use assertEqual instead.
  self.assertEquals(frame.f_locals, _testcapi.frame_getlocals(frame))

Author: vstinner

Lib/test/test_capi.py

@@ -1097,7 +1097,7 @@ def getgenframe(self):
 
     def test_frame_getters(self):
         frame = self.getframe()
-        self.assertEquals(frame.f_locals, _testcapi.frame_getlocals(frame))
+        self.assertEqual(frame.f_locals, _testcapi.frame_getlocals(frame))
         self.assertIs(frame.f_globals, _testcapi.frame_getglobals(frame))
         self.assertIs(frame.f_builtins, _testcapi.frame_getbuiltins(frame))