Bump nokogiri from 1.11.6 to 1.12.5 in /docs

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.11.6 to 1.12.5.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.11.6...v1.12.5)

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

Signed-off-by: dependabot[bot] <support@github.com>

docs/Gemfile.lock

@@ -180,14 +180,14 @@ GEM
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9.7)
     mercenary (0.3.6)
-    mini_portile2 (2.5.3)
+    mini_portile2 (2.6.1)
     minima (2.1.1)
       jekyll (~> 3.3)
     minitest (5.11.3)
     multipart-post (2.1.1)
     net-dns (0.9.0)
-    nokogiri (1.11.6)
-      mini_portile2 (~> 2.5.0)
+    nokogiri (1.12.5)
+      mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
     octokit (4.14.0)
       sawyer (~> 0.8.0, >= 0.5.3)