Use Final for Constant Literals in the stdlib (#12332)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

stdlib/argparse.pyi

@@ -2,7 +2,7 @@ import sys
 from _typeshed import sentinel
 from collections.abc import Callable, Generator, Iterable, Sequence
 from re import Pattern
-from typing import IO, Any, Generic, Literal, NewType, NoReturn, Protocol, TypeVar, overload
+from typing import IO, Any, Final, Generic, NewType, NoReturn, Protocol, TypeVar, overload
 from typing_extensions import Self, TypeAlias, deprecated
 
 __all__ = [
@@ -43,14 +43,14 @@ _ActionStr: TypeAlias = str
 # callers that don't use a literal argument
 _NArgsStr: TypeAlias = str
 
-ONE_OR_MORE: Literal["+"]
-OPTIONAL: Literal["?"]
-PARSER: Literal["A..."]
-REMAINDER: Literal["..."]
+ONE_OR_MORE: Final = "+"
+OPTIONAL: Final = "?"
+PARSER: Final = "A..."
+REMAINDER: Final = "..."
 _SUPPRESS_T = NewType("_SUPPRESS_T", str)
 SUPPRESS: _SUPPRESS_T | str  # not using Literal because argparse sometimes compares SUPPRESS with is
 # the | str is there so that foo = argparse.SUPPRESS; foo = "test" checks out in mypy
-ZERO_OR_MORE: Literal["*"]
+ZERO_OR_MORE: Final = "*"
 _UNRECOGNIZED_ARGS_ATTR: str  # undocumented
 
 class ArgumentError(Exception):