Mark first argument of __[get|set|del]attr__ as str (#9245)

stubs/humanfriendly/humanfriendly/deprecation.pyi

@@ -10,5 +10,5 @@ class DeprecationProxy(types.ModuleType):
     module: Any
     aliases: Any
     def __init__(self, module, aliases) -> None: ...
-    def __getattr__(self, name): ...
+    def __getattr__(self, name: str): ...
     def resolve(self, target): ...