Bump doctoc from 2.0.1 to 2.1.0

Bumps [doctoc](https://github.com/thlorenz/doctoc) from 2.0.1 to 2.1.0.
- [Release notes](https://github.com/thlorenz/doctoc/releases)
- [Commits](thlorenz/doctoc@v2.0.1...v2.1.0)

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

Signed-off-by: dependabot[bot] <support@github.com>