Bump pre-commit from 2.20.0 to 2.21.0 (#340)

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:production
  update-type: version-update:semver-minor
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -2,7 +2,7 @@
 build==0.9.0
 docutils==0.19
 mypy==0.991; implementation_name=="cpython"
-pre-commit==2.20.0
+pre-commit==2.21.0
 pytest==7.2.0
 pytest-asyncio==0.20.3
 pytest-cov==4.0.0