Update http.pyi (#502)

Author: sobolevn

django-stubs/views/decorators/http.pyi

@@ -3,7 +3,7 @@ from typing import Any, Callable, List, Optional, TypeVar
 _F = TypeVar("_F", bound=Callable[..., Any])
 
 def conditional_page(_F) -> _F: ...
-def require_http_methods(request_method_list: List[str]) -> Callable: ...
+def require_http_methods(request_method_list: List[str]) -> Callable[[_F], _F]: ...
 def require_GET(_F) -> _F: ...
 def require_POST(_F) -> _F: ...
 def require_safe(_F) -> _F: ...