typing(_extensions) updates for 3.11 (#7643)

stdlib/typing.pyi

@@ -22,9 +22,12 @@ if sys.version_info >= (3, 11):
         "ForwardRef",
         "Generic",
         "Literal",
+        "LiteralString",
+        "NotRequired",
         "Optional",
         "ParamSpec",
         "Protocol",
+        "Required",
         "Tuple",
         "Type",
         "TypeVar",
@@ -84,9 +87,11 @@ if sys.version_info >= (3, 11):
         "assert_never",
         "assert_type",
         "cast",
+        "clear_overloads",
         "final",
         "get_args",
         "get_origin",
+        "get_overloads",
         "get_type_hints",
         "is_typeddict",
         "Never",
@@ -528,6 +533,9 @@ if sys.version_info >= (3, 11):
     Self: _SpecialForm
     Never: _SpecialForm = ...
     Unpack: _SpecialForm
+    Required: _SpecialForm
+    NotRequired: _SpecialForm
+    LiteralString: _SpecialForm
 
     class TypeVarTuple:
         __name__: str
@@ -1180,6 +1188,8 @@ if sys.version_info >= (3, 11):
     def reveal_type(__obj: _T) -> _T: ...
     def assert_never(__arg: Never) -> Never: ...
     def assert_type(__val: _T, __typ: Any) -> _T: ...
+    def clear_overloads() -> None: ...
+    def get_overloads(func: Callable[..., object]) -> Sequence[Callable[..., object]]: ...
 
 # Type constructors