Remove unneeded type annotations

Author: ianthomas23

lib/matplotlib/backends/registry.pyi

@@ -7,7 +7,6 @@ class BackendFilter(Enum):
 
 
 class BackendRegistry:
-    def __init__(self) -> None: ...
     def backend_for_gui_framework(self, interactive_framework: str) -> str | None: ...
     def list_builtin(self, filter_: BackendFilter | None) -> list[str]: ...
 

lib/matplotlib/rcsetup.pyi

@@ -8,8 +8,6 @@ interactive_bk: list[str]
 non_interactive_bk: list[str]
 all_backends: list[str]
 
-def __dir__() -> list[str]: ...
-
 _T = TypeVar("_T")
 
 def _listify_validator(s: Callable[[Any], _T]) -> Callable[[Any], list[_T]]: ...