dependency: bump commitizen from 3.15.0 to 3.20.0

Bumps [commitizen](https://github.com/commitizen-tools/commitizen) from 3.15.0 to 3.20.0.
- [Release notes](https://github.com/commitizen-tools/commitizen/releases)
- [Changelog](https://github.com/commitizen-tools/commitizen/blob/master/CHANGELOG.md)
- [Commits](commitizen-tools/commitizen@v3.15.0...v3.20.0)

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

Signed-off-by: dependabot[bot] <[email protected]>