upgrade Jekyll to 4.3.4

Gemfile

@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
 
-gem 'jekyll', '~>3.8.4'
+gem 'jekyll', '~>4.3.4'
 gem 'jekyll-paginate'
 gem 'rexml'

Gemfile.lock

@@ -0,0 +1,75 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.8.7)
+      public_suffix (>= 2.0.2, < 7.0)
+    colorator (1.1.0)
+    concurrent-ruby (1.3.4)
+    em-websocket (0.5.3)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0)
+    eventmachine (1.2.7)
+    ffi (1.17.0)
+    forwardable-extended (2.6.0)
+    google-protobuf (3.25.5-x86_64-linux)
+    http_parser.rb (0.8.0)
+    i18n (1.14.6)
+      concurrent-ruby (~> 1.0)
+    jekyll (4.3.4)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      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 (>= 0.3.6, < 0.5)
+      pathutil (~> 0.9)
+      rouge (>= 3.0, < 5.0)
+      safe_yaml (~> 1.0)
+      terminal-table (>= 1.8, < 4.0)
+      webrick (~> 1.7)
+    jekyll-paginate (1.1.0)
+    jekyll-sass-converter (3.0.0)
+      sass-embedded (~> 1.54)
+    jekyll-watch (2.2.1)
+      listen (~> 3.0)
+    kramdown (2.5.1)
+      rexml (>= 3.3.9)
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
+    liquid (4.0.4)
+    listen (3.9.0)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
+    mercenary (0.4.0)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    public_suffix (6.0.1)
+    rake (13.2.1)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.11.1)
+      ffi (~> 1.0)
+    rexml (3.3.9)
+    rouge (4.5.1)
+    safe_yaml (1.0.5)
+    sass-embedded (1.69.5)
+      google-protobuf (~> 3.23)
+      rake (>= 13.0.0)
+    terminal-table (3.0.2)
+      unicode-display_width (>= 1.1.1, < 3)
+    unicode-display_width (2.6.0)
+    webrick (1.9.1)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  jekyll (~> 4.3.4)
+  jekyll-paginate
+  rexml
+
+BUNDLED WITH
+   2.3.5