revert ruby upgrade

.ruby-version

@@ -1 +1 @@
-2.6.10
+2.6.5

Gemfile.lock

@@ -1,44 +1,41 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (6.1.7.10)
+    activesupport (6.0.2.2)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 1.6, < 2)
-      minitest (>= 5.1)
-      tzinfo (~> 2.0)
-      zeitwerk (~> 2.3)
-    addressable (2.8.7)
-      public_suffix (>= 2.0.2, < 7.0)
-    base64 (0.2.0)
-    coderay (1.1.3)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+      zeitwerk (~> 2.2)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
+    coderay (1.1.2)
     colorator (1.1.0)
-    concurrent-ruby (1.3.4)
-    em-websocket (0.5.3)
+    concurrent-ruby (1.1.6)
+    em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0)
+      http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
-    ffi (1.16.3)
+    ffi (1.12.2)
     forwardable-extended (2.6.0)
-    google-protobuf (3.23.4)
-    http_parser.rb (0.8.0)
-    i18n (1.14.6)
+    http_parser.rb (0.6.0)
+    i18n (1.8.2)
       concurrent-ruby (~> 1.0)
-    jekyll (4.3.4)
+    jekyll (4.0.0)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (~> 1.0)
-      jekyll-sass-converter (>= 2.0, < 4.0)
+      i18n (>= 0.9.5, < 2)
+      jekyll-sass-converter (~> 2.0)
       jekyll-watch (~> 2.0)
-      kramdown (~> 2.3, >= 2.3.1)
+      kramdown (~> 2.1)
       kramdown-parser-gfm (~> 1.0)
       liquid (~> 4.0)
-      mercenary (>= 0.3.6, < 0.5)
+      mercenary (~> 0.3.3)
       pathutil (~> 0.9)
-      rouge (>= 3.0, < 5.0)
+      rouge (~> 3.0)
       safe_yaml (~> 1.0)
-      terminal-table (>= 1.8, < 4.0)
-      webrick (~> 1.7)
+      terminal-table (~> 1.8)
     jekyll-admin (0.11.1)
       jekyll (>= 3.7, < 5.0)
       sinatra (>= 1.4)
@@ -48,86 +45,82 @@ GEM
       nokogiri (~> 1.10.4)
     jekyll-redirect-from (0.16.0)
       jekyll (>= 3.3, < 5.0)
-    jekyll-sass-converter (3.0.0)
-      sass-embedded (~> 1.54)
+    jekyll-sass-converter (2.1.0)
+      sassc (> 2.0.1, < 3.0)
     jekyll-toc (0.17.0)
       jekyll (>= 3.9)
       nokogiri (~> 1.10)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    jekyll_picture_tag (2.1.2)
+    jekyll_picture_tag (2.0.4)
       addressable (~> 2.6)
       jekyll (~> 4.0)
       mime-types (~> 3.0)
       objective_elements (~> 1.1)
       rainbow (~> 3.0)
-      ruby-vips (~> 2.2)
-    kramdown (2.5.1)
-      rexml (>= 3.3.9)
+      ruby-vips (~> 2.0.17)
+    kramdown (2.2.1)
+      rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
-    liquid (4.0.4)
-    listen (3.9.0)
+    liquid (4.0.3)
+    listen (3.2.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    logger (1.6.1)
-    mercenary (0.4.0)
-    mime-types (3.6.0)
-      logger
+    mercenary (0.3.6)
+    mime-types (3.4.1)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2024.1105)
+    mime-types-data (3.2023.0218.1)
     mini_portile2 (2.4.0)
-    minitest (5.25.2)
-    multi_json (1.15.0)
-    mustermann (3.0.3)
+    minitest (5.14.0)
+    multi_json (1.14.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     objective_elements (1.1.2)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (5.1.1)
-    pygments.rb (3.0.0)
-    rack (2.2.10)
-    rack-protection (3.2.0)
-      base64 (>= 0.1.0)
+    public_suffix (4.0.4)
+    pygments.rb (1.2.1)
+      multi_json (>= 1.0.0)
+    rack (2.2.8)
+    rack-protection (3.1.0)
       rack (~> 2.2, >= 2.2.4)
     rainbow (3.1.1)
-    rake (13.2.1)
-    rb-fsevent (0.11.2)
-    rb-inotify (0.11.1)
+    rake (13.0.1)
+    rb-fsevent (0.10.4)
+    rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.3.9)
-    rouge (3.30.0)
-    ruby-vips (2.2.2)
-      ffi (~> 1.12)
-      logger
+    rexml (3.2.4)
+    rouge (3.18.0)
+    ruby-vips (2.0.17)
+      ffi (~> 1.9)
     ruby2_keywords (0.0.5)
     safe_yaml (1.0.5)
-    sass-embedded (1.58.3)
-      google-protobuf (~> 3.21)
-      rake (>= 10.0.0)
-    sinatra (3.2.0)
+    sassc (2.3.0)
+      ffi (~> 1.9)
+    sinatra (3.1.0)
       mustermann (~> 3.0)
       rack (~> 2.2, >= 2.2.4)
-      rack-protection (= 3.2.0)
+      rack-protection (= 3.1.0)
       tilt (~> 2.0)
-    sinatra-contrib (3.2.0)
-      multi_json (>= 0.0.2)
+    sinatra-contrib (3.1.0)
+      multi_json
       mustermann (~> 3.0)
-      rack-protection (= 3.2.0)
-      sinatra (= 3.2.0)
+      rack-protection (= 3.1.0)
+      sinatra (= 3.1.0)
       tilt (~> 2.0)
-    stringex (2.8.6)
-    terminal-table (3.0.2)
-      unicode-display_width (>= 1.1.1, < 3)
-    thor (1.3.2)
-    tilt (2.4.0)
-    tzinfo (2.0.6)
-      concurrent-ruby (~> 1.0)
-    unicode-display_width (2.6.0)
-    webrick (1.9.0)
-    zeitwerk (2.6.18)
+    stringex (2.8.5)
+    terminal-table (1.8.0)
+      unicode-display_width (~> 1.1, >= 1.1.1)
+    thor (1.0.1)
+    thread_safe (0.3.6)
+    tilt (2.3.0)
+    tzinfo (1.2.7)
+      thread_safe (~> 0.1)
+    unicode-display_width (1.7.0)
+    zeitwerk (2.3.0)
 
 PLATFORMS
   ruby
@@ -148,4 +141,4 @@ DEPENDENCIES
   thor
 
 BUNDLED WITH
-   1.17.2
+   2.1.4