Bump pre-commit from 2.20.0 to 2.21.0 (#167)

Bumps [pre-commit](https://github.com/pre-commit/pre-commit) from 2.20.0 to 2.21.0.
- [Release notes](https://github.com/pre-commit/pre-commit/releases)
- [Changelog](https://github.com/pre-commit/pre-commit/blob/main/CHANGELOG.md)
- [Commits](pre-commit/pre-commit@v2.20.0...v2.21.0)

---
updated-dependencies:
- dependency-name: pre-commit
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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