Use PEP 585 syntax in Python 2, protobuf & _ast stubs, where possible (#6949)

stubs/enum34/@python2/enum.pyi

@@ -1,10 +1,10 @@
 import sys
 from _typeshed import Self
 from abc import ABCMeta
-from typing import Any, Dict, Iterator, List, Mapping, Type, TypeVar, Union
+from typing import Any, Iterator, Mapping, TypeVar, Union
 
 _T = TypeVar("_T")
-_S = TypeVar("_S", bound=Type[Enum])
+_S = TypeVar("_S", bound=type[Enum])
 
 # Note: EnumMeta actually subclasses type directly, not ABCMeta.
 # This is a temporary workaround to allow multiple creation of enums with builtins
@@ -12,12 +12,12 @@ _S = TypeVar("_S", bound=Type[Enum])
 # spurious inconsistent metaclass structure. See #1595.
 # Structurally: Iterable[T], Reversible[T], Container[T] where T is the enum itself
 class EnumMeta(ABCMeta):
-    def __iter__(self: Type[_T]) -> Iterator[_T]: ...
-    def __reversed__(self: Type[_T]) -> Iterator[_T]: ...
+    def __iter__(self: type[_T]) -> Iterator[_T]: ...
+    def __reversed__(self: type[_T]) -> Iterator[_T]: ...
     def __contains__(self, member: object) -> bool: ...
-    def __getitem__(self: Type[_T], name: str) -> _T: ...
+    def __getitem__(self: type[_T], name: str) -> _T: ...
     @property
-    def __members__(self: Type[_T]) -> Mapping[str, _T]: ...
+    def __members__(self: type[_T]) -> Mapping[str, _T]: ...
     def __len__(self) -> int: ...
 
 class Enum(metaclass=EnumMeta):
@@ -25,21 +25,21 @@ class Enum(metaclass=EnumMeta):
     value: Any
     _name_: str
     _value_: Any
-    _member_names_: List[str]  # undocumented
-    _member_map_: Dict[str, Enum]  # undocumented
-    _value2member_map_: Dict[int, Enum]  # undocumented
+    _member_names_: list[str]  # undocumented
+    _member_map_: dict[str, Enum]  # undocumented
+    _value2member_map_: dict[int, Enum]  # undocumented
     if sys.version_info >= (3, 7):
-        _ignore_: Union[str, List[str]]
+        _ignore_: Union[str, list[str]]
     _order_: str
     __order__: str
     @classmethod
     def _missing_(cls, value: object) -> Any: ...
     @staticmethod
-    def _generate_next_value_(name: str, start: int, count: int, last_values: List[Any]) -> Any: ...
-    def __new__(cls: Type[_T], value: object) -> _T: ...
+    def _generate_next_value_(name: str, start: int, count: int, last_values: list[Any]) -> Any: ...
+    def __new__(cls: type[_T], value: object) -> _T: ...
     def __repr__(self) -> str: ...
     def __str__(self) -> str: ...
-    def __dir__(self) -> List[str]: ...
+    def __dir__(self) -> list[str]: ...
     def __format__(self, format_spec: str) -> str: ...
     def __hash__(self) -> Any: ...
     def __reduce_ex__(self, proto: object) -> Any: ...