pathlib.Path.__exit__ always returns None (#7192)

Source code here: https://github.com/python/cpython/blob/0ae40191793da1877a12d512f0116d99301b2c51/Lib/pathlib.py#L893

It has always returned `None`, by the looks of things.

stdlib/pathlib.pyi

@@ -65,7 +65,7 @@ class Path(PurePath):
     def __enter__(self: Self) -> Self: ...
     def __exit__(
         self, exc_type: type[BaseException] | None, exc_value: BaseException | None, traceback: TracebackType | None
-    ) -> bool | None: ...
+    ) -> None: ...
     @classmethod
     def cwd(cls: type[Self]) -> Self: ...
     if sys.version_info >= (3, 10):