Bump pre-commit from 2.6.0 to 2.8.1

Bumps [pre-commit](https://github.com/pre-commit/pre-commit) from 2.6.0 to 2.8.1.
- [Release notes](https://github.com/pre-commit/pre-commit/releases)
- [Changelog](https://github.com/pre-commit/pre-commit/blob/master/CHANGELOG.md)
- [Commits](pre-commit/pre-commit@v2.6.0...v2.8.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>