chore(deps-dev): bump doctoc from 2.1.0 to 2.2.1

Bumps [doctoc](https://github.com/thlorenz/doctoc) from 2.1.0 to 2.2.1.
- [Release notes](https://github.com/thlorenz/doctoc/releases)
- [Commits](https://github.com/thlorenz/doctoc/commits)

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

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Author: dependabot[bot]