Upgrade rubygem versions.

docs/_spec/Dockerfile

@@ -1,13 +1,12 @@
-FROM ruby:2.7
+FROM ruby:3.3
 
 RUN apt-get install -y curl \
   && curl -sL https://deb.nodesource.com/setup_18.x | bash - \
   && apt-get install -y nodejs \
   && curl -L https://www.npmjs.com/install.sh | sh
 
-RUN gem update --system
-RUN gem install sass-embedded -v 1.58.0
-RUN gem install bundler:1.17.2 jekyll
+RUN gem update --system 3.5.6
+RUN gem install bundler:2.5.6
 
 WORKDIR /srv/jekyll
 

docs/_spec/Gemfile

@@ -1,8 +1,8 @@
-# To build the spec on Travis CI
 source "https://rubygems.org"
+ruby "3.3"
 
-gem "jekyll", "3.6.3"
-gem "webrick"
+gem "jekyll", "4.3.3"
 gem "rouge"
-# gem 's3_website'
-gem "redcarpet", "3.5.1"
+gem "rexml"
+gem "sass-embedded"
+gem "csv"

docs/_spec/Gemfile.lock

@@ -1,57 +1,78 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.1)
+    addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
     colorator (1.1.0)
-    ffi (1.15.5)
+    concurrent-ruby (1.2.3)
+    csv (3.2.8)
+    em-websocket (0.5.3)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0)
+    eventmachine (1.2.7)
+    ffi (1.16.3)
     forwardable-extended (2.6.0)
-    jekyll (3.6.3)
+    google-protobuf (3.25.3-x86_64-linux)
+    http_parser.rb (0.8.0)
+    i18n (1.14.1)
+      concurrent-ruby (~> 1.0)
+    jekyll (4.3.3)
       addressable (~> 2.4)
       colorator (~> 1.0)
-      jekyll-sass-converter (~> 1.0)
-      jekyll-watch (~> 1.1)
-      kramdown (~> 1.14)
+      em-websocket (~> 0.5)
+      i18n (~> 1.0)
+      jekyll-sass-converter (>= 2.0, < 4.0)
+      jekyll-watch (~> 2.0)
+      kramdown (~> 2.3, >= 2.3.1)
+      kramdown-parser-gfm (~> 1.0)
       liquid (~> 4.0)
-      mercenary (~> 0.3.3)
+      mercenary (>= 0.3.6, < 0.5)
       pathutil (~> 0.9)
-      rouge (>= 1.7, < 3)
+      rouge (>= 3.0, < 5.0)
       safe_yaml (~> 1.0)
-    jekyll-sass-converter (1.5.2)
-      sass (~> 3.4)
-    jekyll-watch (1.5.1)
+      terminal-table (>= 1.8, < 4.0)
+      webrick (~> 1.7)
+    jekyll-sass-converter (3.0.0)
+      sass-embedded (~> 1.54)
+    jekyll-watch (2.2.1)
       listen (~> 3.0)
-    kramdown (1.17.0)
-    liquid (4.0.3)
-    listen (3.7.1)
+    kramdown (2.4.0)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
+    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)
+    mercenary (0.4.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (5.0.0)
+    public_suffix (5.0.4)
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    redcarpet (3.5.1)
-    rouge (2.2.1)
+    rexml (3.2.6)
+    rouge (4.2.0)
     safe_yaml (1.0.5)
-    sass (3.7.4)
-      sass-listen (~> 4.0.0)
-    sass-listen (4.0.0)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-    webrick (1.7.0)
+    sass-embedded (1.71.0-x86_64-linux-gnu)
+      google-protobuf (~> 3.25)
+    terminal-table (3.0.2)
+      unicode-display_width (>= 1.1.1, < 3)
+    unicode-display_width (2.5.0)
+    webrick (1.8.1)
 
 PLATFORMS
-  ruby
   x86_64-linux
 
 DEPENDENCIES
-  jekyll (= 3.6.3)
-  redcarpet (= 3.5.1)
+  csv
+  jekyll (= 4.3.3)
+  rexml
   rouge
-  webrick
+  sass-embedded
+
+RUBY VERSION
+   ruby 3.3.0p0
 
 BUNDLED WITH
-   2.3.5
+   2.5.6

docs/_spec/_config.yml

@@ -5,7 +5,7 @@ versionCompareMessage: "an upcoming"
 safe: true
 lsi: false
 highlighter: false
-markdown: redcarpet
+markdown: kramdown
 encoding: utf-8
-redcarpet:
-  extensions: ["no_intra_emphasis", "fenced_code_blocks", "autolink", "tables", "with_toc_data", "strikethrough", "lax_spacing", "space_after_headers", "superscript", "footnotes", "disable_indented_code_blocks"]
+kramdown:
+  input: GFM