Fix classonlymethod decorator declaration (#1494)

django-stubs/utils/decorators.pyi

@@ -10,7 +10,7 @@ from django.views.generic.base import View
 _T = TypeVar("_T", bound=View | Callable)  # Any callable
 _CallableType = TypeVar("_CallableType", bound=Callable)
 
-class classonlymethod(classmethod): ...
+classonlymethod = classmethod
 
 def method_decorator(decorator: Callable | Iterable[Callable], name: str = ...) -> Callable[[_T], _T]: ...
 def decorator_from_middleware_with_args(middleware_class: type) -> Callable: ...

tests/typecheck/utils/test_decorators.yml

@@ -1,3 +1,13 @@
+-   case: classonlymethod
+    main: |
+      from django.utils.decorators import classonlymethod
+
+      class Bananaman:
+          @classonlymethod
+          def count_bananas(cls) -> int:
+              return 12
+
+      reveal_type(Bananaman.count_bananas)  # N: Revealed type is "def () -> builtins.int"
 -   case: method_decorator_class
     main: |
       from django.views.generic.base import View