Bump nokogiri from 1.11.4 to 1.12.5 in /docs

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.11.4 to 1.12.5.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.11.4...v1.12.5)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: direct:production
...

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

docs/Gemfile

@@ -1,3 +1,3 @@
 source 'https://rubygems.org'
 gem 'github-pages', group: :jekyll_plugins
-gem 'nokogiri', '~> 1.11'
+gem 'nokogiri', '~> 1.12'

docs/Gemfile.lock

@@ -211,7 +211,7 @@ GEM
       jekyll-seo-tag (~> 2.1)
     minitest (5.14.4)
     multipart-post (2.1.1)
-    nokogiri (1.11.4-x86_64-linux)
+    nokogiri (1.12.5-x86_64-linux)
       racc (~> 1.4)
     octokit (4.20.0)
       faraday (>= 0.9)
@@ -258,7 +258,7 @@ PLATFORMS
 
 DEPENDENCIES
   github-pages
-  nokogiri (~> 1.11)
+  nokogiri (~> 1.12)
 
 BUNDLED WITH
    2.2.14