Fixed grid_columnconfigure() and grid_rowconfigure() methods of
Tkinter widgets to work in wantobjects=True mode.
Issue #20510: Confirm that the code attribute of the SystemExit
exception raised by sys.exit is None when no code is given.

As suggested by Serhiy Storchaka.
Issue #6815: os.path.expandvars() now supports non-ASCII Unicode environment
variables names and values.
update logo url (#20695)