various updates from upstream python/typing repo:
- Added typing.Counter and typing.ChainMap generics
- More flexible typing.NamedTuple
- Improved generic ABC caching
- More tests
- Bugfixes
- Other updates
* Add Misc/NEWS entry
* Add issue number
Contributed by Ivan Levkivskyi @ilevkivskyi
(cherry picked from commit b692dc8475)
