contrib: update to latest Python 2.7, 3.7, and 3.8
We would ideally update the 3.5 and 3.6 versions as well. But Python
didn't generate exe installers for newer versions for some reason.
Differential Revision: https://phab.mercurial-scm.org/D8466
Our full contribution guidelines are in our wiki, please see:
https://www.mercurial-scm.org/wiki/ContributingChanges
If you just want a checklist to follow, you can go straight to
https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
If you can't run the entire testsuite for some reason (it can be
difficult on Windows), please at least run `contrib/check-code.py` on
any files you've modified and run `python contrib/check-commit` on any
commits you've made (for example, `python contrib/check-commit
273ce12ad8f1` will report some style violations on a very old commit).