Bump nokogiri from 1.18.8 to 1.18.9 in /docs

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-version: 1.18.9
  dependency-type: indirect
...

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

Author: dependabot[bot]

docs/Gemfile.lock

@@ -226,7 +226,7 @@ GEM
       jekyll-seo-tag (~> 2.1)
     minitest (5.23.0)
     mutex_m (0.2.0)
-    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)