Drop support for EOL Python 3.6

[hugovk]

Python 3.6 is EOL and no longer receiving security updates (or any updates) from the core Python team.

cycle	latest	release	eol
3.10	3.10.1	2021-10-04	2026-10-04
3.9	3.9.9	2020-10-05	2025-10-05
3.8	3.8.12	2019-10-14	2024-10-14
3.7	3.7.12	2018-06-27	2023-06-27
3.6	3.6.15	2016-12-23	2021-12-23

https://endoflife.date/python

[willkg]

I didn't realize GitHub was going to merge the main branch into this one. Super irritating.

I undid that and then rebased against the main branch and then force-pushed into your branch. Super sorry about that.

[willkg]

Thank you!

[hugovk]

No problem at all, and you're welcome!

If you initially updated this using the "Update branch" button, there's now also an option to "Update with rebase":

https://github.blog/changelog/2022-02-03-more-ways-to-keep-your-pull-request-branch-up-to-date/

[willkg]

I saw that and that's why I was bummed I messed up somehow and did a merge commit. I'll get it the next time (hopefully).

Thanks!