build(deps-dev): bump xdoctest from 1.1.5 to 1.2.0

Bumps [xdoctest](https://github.com/Erotemic/xdoctest) from 1.1.5 to 1.2.0.
- [Release notes](https://github.com/Erotemic/xdoctest/releases)
- [Changelog](https://github.com/Erotemic/xdoctest/blob/main/CHANGELOG.md)
- [Commits](Erotemic/xdoctest@v1.1.5...v1.2.0)

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

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