Bump dunamai from 1.19.0 to 1.21.1

Bumps [dunamai](https://github.com/mtkennerly/dunamai) from 1.19.0 to 1.21.1.
- [Release notes](https://github.com/mtkennerly/dunamai/releases)
- [Changelog](https://github.com/mtkennerly/dunamai/blob/master/CHANGELOG.md)
- [Commits](mtkennerly/dunamai@v1.19.0...v1.21.1)

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

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