fix: docs/Gemfile & docs/Gemfile.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-ACTIVESUPPORT-5851458

docs/Gemfile

@@ -1,2 +1,2 @@
 source 'https://rubygems.org'
-gem 'github-pages', '>= 225', group: :jekyll_plugins
+gem 'github-pages', '>= 228', group: :jekyll_plugins

docs/Gemfile.lock

@@ -1,43 +1,42 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (6.0.6)
+    activesupport (7.0.7.2)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 0.7, < 2)
-      minitest (~> 5.1)
-      tzinfo (~> 1.1)
-      zeitwerk (~> 2.2, >= 2.2.2)
-    addressable (2.8.1)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+    addressable (2.8.5)
       public_suffix (>= 2.0.2, < 6.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.11.1)
     colorator (1.1.0)
-    commonmarker (0.23.6)
-    concurrent-ruby (1.1.10)
-    dnsruby (1.61.9)
-      simpleidn (~> 0.1)
+    commonmarker (0.23.10)
+    concurrent-ruby (1.2.2)
+    dnsruby (1.70.0)
+      simpleidn (~> 0.2.1)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
-    ethon (0.15.0)
+    ethon (0.16.0)
       ffi (>= 1.15.0)
     eventmachine (1.2.7)
     execjs (2.8.1)
-    faraday (2.6.0)
+    faraday (2.7.10)
       faraday-net_http (>= 2.0, < 3.1)
       ruby2_keywords (>= 0.0.4)
-    faraday-net_http (3.0.0)
+    faraday-net_http (3.0.2)
     ffi (1.15.5)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
-    github-pages (227)
+    github-pages (228)
       github-pages-health-check (= 1.17.9)
-      jekyll (= 3.9.2)
+      jekyll (= 3.9.3)
       jekyll-avatar (= 0.7.0)
       jekyll-coffeescript (= 1.1.1)
-      jekyll-commonmark-ghpages (= 0.2.0)
+      jekyll-commonmark-ghpages (= 0.4.0)
       jekyll-default-layout (= 0.1.4)
       jekyll-feed (= 0.15.1)
       jekyll-gist (= 1.5.0)
@@ -71,7 +70,7 @@ GEM
       jemoji (= 0.12.0)
       kramdown (= 2.3.2)
       kramdown-parser-gfm (= 1.1.0)
-      liquid (= 4.0.3)
+      liquid (= 4.0.4)
       mercenary (~> 0.3)
       minima (= 2.5.1)
       nokogiri (>= 1.13.6, < 2.0)
@@ -83,17 +82,17 @@ GEM
       octokit (~> 4.0)
       public_suffix (>= 3.0, < 5.0)
       typhoeus (~> 1.3)
-    html-pipeline (2.14.2)
+    html-pipeline (2.14.3)
       activesupport (>= 2)
       nokogiri (>= 1.4)
     http_parser.rb (0.8.0)
-    i18n (0.9.5)
+    i18n (1.14.1)
       concurrent-ruby (~> 1.0)
-    jekyll (3.9.2)
+    jekyll (3.9.3)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (~> 0.7)
+      i18n (>= 0.7, < 2)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 2.0)
       kramdown (>= 1.17, < 3)
@@ -109,11 +108,11 @@ GEM
       coffee-script-source (~> 1.11.1)
     jekyll-commonmark (1.4.0)
       commonmarker (~> 0.22)
-    jekyll-commonmark-ghpages (0.2.0)
-      commonmarker (~> 0.23.4)
+    jekyll-commonmark-ghpages (0.4.0)
+      commonmarker (~> 0.23.7)
       jekyll (~> 3.9.0)
       jekyll-commonmark (~> 1.4.0)
-      rouge (>= 2.0, < 4.0)
+      rouge (>= 2.0, < 5.0)
     jekyll-default-layout (0.1.4)
       jekyll (~> 3.0)
     jekyll-feed (0.15.1)
@@ -201,31 +200,31 @@ GEM
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
-    liquid (4.0.3)
-    listen (3.7.1)
+    liquid (4.0.4)
+    listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    mini_portile2 (2.8.0)
+    mini_portile2 (2.8.4)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
-    minitest (5.16.3)
-    nokogiri (1.13.8)
-      mini_portile2 (~> 2.8.0)
+    minitest (5.19.0)
+    nokogiri (1.15.4)
+      mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     octokit (4.25.1)
       faraday (>= 1, < 3)
       sawyer (~> 0.9)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.7)
-    racc (1.6.0)
+    racc (1.7.1)
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.2.6)
     rouge (3.26.0)
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
@@ -242,22 +241,20 @@ GEM
       unf (~> 0.1.4)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    thread_safe (0.3.6)
     typhoeus (1.4.0)
       ethon (>= 0.9.0)
-    tzinfo (1.2.10)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8.2)
     unicode-display_width (1.8.0)
-    zeitwerk (2.6.1)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  github-pages (>= 225)
+  github-pages (>= 228)
 
 BUNDLED WITH
    1.17.3