Bump nokogiri from 1.17.0 to 1.18.3 in /docs (#1057)

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.17.0 to 1.18.3.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/v1.18.3/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.17.0...v1.18.3)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/Gemfile.lock

@@ -235,7 +235,7 @@ GEM
     minitest (5.25.4)
     net-http (0.6.0)
       uri
-    nokogiri (1.17.0)
+    nokogiri (1.18.3)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     octokit (4.25.1)