Update pre-commit to 2.9.1

[pyup-bot]

This PR updates pre-commit from 2.9.0 to 2.9.1.

Changelog

2.9.1

==================

Fixes
- Improve error message for "hook goes missing"
 - 1709 PR by paulhfischer.
 - 1708 issue by theod07.
- Add warning for `/*` in `files` / `exclude` regexes
 - 1707 PR by paulhfischer.
 - 1702 issue by asottile.
- Fix `healthy()` check for `language: python` on windows when the base
executable has non-ascii characters.
 - 1713 PR by asottile.
 - 1711 issue by Najiva.

Links

• PyPI: https://pypi.org/project/pre-commit
• Changelog: https://pyup.io/changelogs/pre-commit/
• Repo: https://github.com/pre-commit/pre-commit

[coveralls]

Coverage remained the same at 86.667% when pulling d97259d on pyup-update-pre-commit-2.9.0-to-2.9.1 into ecb9b8f on master.

[pyup-bot]

Closing this in favor of #235