build(deps): bump nokogiri from 1.13.0 to 1.13.1 in /docs

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.13.0 to 1.13.1.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.13.0...v1.13.1)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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