Update assertEquals to assertEqual

Fixes authentication tests for Python >= 3.12.

See: #95

tests/test_authentication.py

@@ -436,7 +436,7 @@ def disconnect(self):
     def setTest(self, test):
         self.test = test
         self.assertTrue = self.test.assertTrue
-        self.assertEquals = self.test.assertEquals
+        self.assertEqual = self.test.assertEqual
         self.fail = self.test.fail
 
     def succeed(self):