build(deps): bump nokogiri from 1.13.2 to 1.13.4 in /kythe/web/site (#5252)

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.13.2 to 1.13.4.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/v1.13.4/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.13.2...v1.13.4)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: direct:production
...

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