Update OptionParser.{error,exit} to be NoReturn (#12464)

Author: AA-Turner

stdlib/optparse.pyi

@@ -1,7 +1,7 @@
 from _typeshed import Incomplete
 from abc import abstractmethod
 from collections.abc import Callable, Iterable, Mapping, Sequence
-from typing import IO, Any, AnyStr, Literal, overload
+from typing import IO, Any, AnyStr, Literal, NoReturn, overload
 
 __all__ = [
     "Option",
@@ -231,8 +231,8 @@ class OptionParser(OptionContainer):
     def check_values(self, values: Values, args: list[str]) -> tuple[Values, list[str]]: ...
     def disable_interspersed_args(self) -> None: ...
     def enable_interspersed_args(self) -> None: ...
-    def error(self, msg: str) -> None: ...
-    def exit(self, status: int = 0, msg: str | None = None) -> None: ...
+    def error(self, msg: str) -> NoReturn: ...
+    def exit(self, status: int = 0, msg: str | None = None) -> NoReturn: ...
     def expand_prog_name(self, s: str) -> str: ...
     def format_epilog(self, formatter: HelpFormatter) -> str: ...
     def format_help(self, formatter: HelpFormatter | None = None) -> str: ...