Fix typo in test_typing.py (GH-26853)

maximium -> maximum

Lib/test/test_typing.py

@@ -517,7 +517,7 @@ class LiteralTests(BaseTestCase):
 
     def test_illegal_parameters_do_not_raise_runtime_errors(self):
         # Type checkers should reject these types, but we do not
-        # raise errors at runtime to maintain maximium flexibility.
+        # raise errors at runtime to maintain maximum flexibility.
         Literal[int]
         Literal[3j + 2, ..., ()]
         Literal[{"foo": 3, "bar": 4}]