Bump nokogiri from 1.18.3 to 1.18.4 in /docs (#1059)

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.18.3
to 1.18.4.

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

@@ -235,7 +235,7 @@ GEM
     minitest (5.25.4)
     net-http (0.6.0)
       uri
-    nokogiri (1.18.3)
+    nokogiri (1.18.4)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     octokit (4.25.1)