add sys._getframemodulename (#14371)

Co-authored-by: Brian Schubert <brianm.schubert@gmail.com>

Author: asottile

stdlib/sys/__init__.pyi

@@ -345,6 +345,10 @@ else:
 
 def _current_frames() -> dict[int, FrameType]: ...
 def _getframe(depth: int = 0, /) -> FrameType: ...
+
+if sys.version_info >= (3, 12):
+    def _getframemodulename(depth: int = 0) -> str | None: ...
+
 def _debugmallocstats() -> None: ...
 def __displayhook__(object: object, /) -> None: ...
 def __excepthook__(exctype: type[BaseException], value: BaseException, traceback: TracebackType | None, /) -> None: ...