build(deps): bump nokogiri from 1.13.8 to 1.13.9 in /docs (#2964)

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.13.8 to 1.13.9.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/v1.13.9/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.13.8...v1.13.9)

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

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

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

Author: dependabot[bot]

docs/Gemfile.lock

@@ -128,7 +128,7 @@ GEM
     minima (2.0.0)
     minitest (5.16.3)
     net-dns (0.9.0)
-    nokogiri (1.13.8)
+    nokogiri (1.13.9)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     octokit (4.25.1)