chore(deps-dev): bump xmlschema from 2.2.3 to 2.4.0

Bumps [xmlschema](https://github.com/sissaschool/xmlschema) from 2.2.3 to 2.4.0.
- [Release notes](https://github.com/sissaschool/xmlschema/releases)
- [Changelog](https://github.com/sissaschool/xmlschema/blob/master/CHANGELOG.rst)
- [Commits](sissaschool/xmlschema@v2.2.3...v2.4.0)

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

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