fix: docs/Gemfile & docs/Gemfile.lock to reduce vulnerabilities (#1361)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-NOKOGIRI-1726792

docs/Gemfile

@@ -14,7 +14,7 @@ gem "minima", "~> 2.5"
 
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
 # uncomment the line below. To upgrade, run `bundle update github-pages`.
-# gem "github-pages", group: :jekyll_plugins
+# gem "github-pages", ">= 219", group: :jekyll_plugins
 # gem "github-pages", "~> 217", group: :jekyll_plugins
 gem "github-pages", group: :jekyll_plugins
 

docs/Gemfile.lock

@@ -219,12 +219,16 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
+    mini_portile2 (2.6.1)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
     minitest (5.14.4)
     multipart-post (2.1.1)
+    nokogiri (1.12.5)
+      mini_portile2 (~> 2.6.1)
+      racc (~> 1.4)
     nokogiri (1.12.5-x86_64-darwin)
       racc (~> 1.4)
     nokogiri (1.12.5-x86_64-linux)
@@ -271,6 +275,7 @@ GEM
     zeitwerk (2.4.2)
 
 PLATFORMS
+  ruby
   x86_64-darwin-20
   x86_64-linux
 
@@ -285,4 +290,4 @@ DEPENDENCIES
   webrick (~> 1.7)
 
 BUNDLED WITH
-   2.2.25
+   2.1.4