CI: unpin isort 5 (#35134)
- [x] closes #35134
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

@TomAugspurger i'm thinking that if/when we merge this to master maybe we should backport this otherwise we could end up with some auto backports failing and needing to do them manually. wdyt? (or we could defer this until post 1.1.1) Merging and backporting sounds fine.

On Thu, Jul 30, 2020 at 9:38 AM Simon Hawkins <notifications@github.com>
wrote:

> @TomAugspurger <https://github.com/TomAugspurger> i'm thinking that
> if/when we merge this to master maybe we should backport this otherwise we
> could end up with some auto backports failing and needing to do them
> manually. wdyt?
>
> —
> You are receiving this because you were mentioned.
> Reply to this email directly, view it on GitHub
> <https://github.com/pandas-dev/pandas/pull/35470#issuecomment-666407014>,
> or unsubscribe
> <https://github.com/notifications/unsubscribe-auth/AAKAOIWWSOSR4IW6HGNGCBTR6GAXXANCNFSM4PL6UEUQ>
> .
>
 will merge this tomorrow if no objections.  Thanks @VirosaLi  @MeeseeksDev backport to 1.1.x