optparse: fix unconstrained TypeVar (#7936)

Part of #7928

Author: JelleZijlstra

stdlib/optparse.pyi

@@ -240,7 +240,10 @@ class OptionParser(OptionContainer):
     def get_prog_name(self) -> str: ...
     def get_usage(self) -> str: ...
     def get_version(self) -> str: ...
-    def parse_args(self, args: Sequence[AnyStr] | None = ..., values: Values | None = ...) -> tuple[Values, list[AnyStr]]: ...
+    @overload
+    def parse_args(self, args: None = ..., values: Values | None = ...) -> tuple[Values, list[str]]: ...
+    @overload
+    def parse_args(self, args: Sequence[AnyStr], values: Values | None = ...) -> tuple[Values, list[AnyStr]]: ...
     def print_usage(self, file: IO[str] | None = ...) -> None: ...
     def print_help(self, file: IO[str] | None = ...) -> None: ...
     def print_version(self, file: IO[str] | None = ...) -> None: ...