chore(deps-dev): Bump nokogiri from 1.18.8 to 1.18.9 in /docs (#402)

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docs/Gemfile.lock

@@ -223,7 +223,7 @@ GEM
     mutex_m (0.2.0)
     net-http (0.4.1)
       uri
-    nokogiri (1.18.8-x86_64-linux-gnu)
+    nokogiri (1.18.9-x86_64-linux-gnu)
       racc (~> 1.4)
     octokit (4.25.1)
       faraday (>= 1, < 3)