Fix incorrect regster() calls in TestSingleDispatch.test_method_signatures

See #130309 (comment)

Author: johnslavik

Lib/test/test_functools.py

@@ -3448,34 +3448,34 @@ def _(item: int, arg: bytes) -> str:
 
     def test_method_signatures(self):
         class A:
-            def m(self, item, arg: int) -> str:
+            def m(self, item: int, arg) -> str:
                 return str(item)
             @classmethod
-            def cm(cls, item, arg: int) -> str:
+            def cm(cls, item: int, arg) -> str:
                 return str(item)
             @functools.singledispatchmethod
-            def func(self, item, arg: int) -> str:
+            def func(self, item: int, arg) -> str:
                 return str(item)
             @func.register
-            def _(self, item, arg: bytes) -> str:
+            def _(self, item: bytes, arg) -> str:
                 return str(item)
 
             @functools.singledispatchmethod
             @classmethod
-            def cls_func(cls, item, arg: int) -> str:
+            def cls_func(cls, item: int, arg) -> str:
                 return str(arg)
             @func.register
             @classmethod
-            def _(cls, item, arg: bytes) -> str:
+            def _(cls, item: bytes, arg) -> str:
                 return str(item)
 
             @functools.singledispatchmethod
             @staticmethod
-            def static_func(item, arg: int) -> str:
+            def static_func(item: int, arg) -> str:
                 return str(arg)
             @func.register
             @staticmethod
-            def _(item, arg: bytes) -> str:
+            def _(item: bytes, arg) -> str:
                 return str(item)
 
         self.assertEqual(str(Signature.from_callable(A.func)),