stdlib: Add many missing dunder overrides (#7231)

stdlib/enum.pyi

@@ -25,6 +25,7 @@ _EnumNames = Union[str, Iterable[str], Iterable[Iterable[Union[str, Any]]], Mapp
 
 class _EnumDict(dict[str, Any]):
     def __init__(self) -> None: ...
+    def __setitem__(self, key: str, value: Any) -> None: ...
 
 # Note: EnumMeta actually subclasses type directly, not ABCMeta.
 # This is a temporary workaround to allow multiple creation of enums with builtins
@@ -56,6 +57,8 @@ class EnumMeta(ABCMeta):
     def __members__(self: type[_T]) -> types.MappingProxyType[str, _T]: ...
     def __len__(self) -> int: ...
     def __bool__(self) -> Literal[True]: ...
+    def __setattr__(self, name: str, value: Any) -> None: ...
+    def __delattr__(self, name: str) -> None: ...
     if sys.version_info >= (3, 11):
         # Simple value lookup
         @overload  # type: ignore[override]