dev: update to ruby 2.6.2

This is the current version of ruby provided in codespaces

Author: ngjunsiang

Gemfile

@@ -1,4 +1,12 @@
 source "https://rubygems.org"
+
+# Required from Ruby 3.4.0
+gem "base64"
+gem "bigdecimal"
+
+# Required from Ruby 3.5.0
+gem "logger"
+
 # Hello! This is where you manage which Jekyll version is used to run.
 # When you want to use a different version, change it below, save the
 # file and run `bundle install`. Run Jekyll with `bundle exec`, like so:

Gemfile.lock

@@ -3,14 +3,16 @@ GEM
   specs:
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
+    base64 (0.3.0)
+    bigdecimal (3.3.1)
     colorator (1.1.0)
     concurrent-ruby (1.3.4)
     csv (3.2.8)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
     eventmachine (1.2.7)
-    ffi (1.17.0-x86_64-linux-gnu)
+    ffi (1.17.2-x86_64-linux-gnu)
     forwardable-extended (2.6.0)
     http_parser.rb (0.8.0)
     i18n (1.14.6)
@@ -47,6 +49,7 @@ GEM
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
+    logger (1.7.0)
     mercenary (0.3.6)
     monophase (0.1.0)
       jekyll (~> 3.9)
@@ -71,42 +74,20 @@ GEM
     webrick (1.9.0)
 
 PLATFORMS
-  aarch64-linux
-  aarch64-linux-android
-  aarch64-linux-gnu
-  aarch64-linux-musl
-  aarch64-mingw-ucrt
-  arm-linux-androideabi
-  arm-linux-gnu
-  arm-linux-gnueabihf
-  arm-linux-musl
-  arm-linux-musleabihf
-  arm64-darwin
-  riscv64-linux-android
-  riscv64-linux-gnu
-  riscv64-linux-musl
-  ruby
-  x86-cygwin
-  x86-linux
-  x86-linux-android
-  x86-linux-gnu
-  x86-linux-musl
-  x86-mingw-ucrt
-  x86_64-cygwin
-  x86_64-darwin
-  x86_64-linux-android
   x86_64-linux-gnu
-  x86_64-linux-musl
 
 DEPENDENCIES
+  base64
+  bigdecimal
   http_parser.rb (~> 0.6.0)
   jekyll (~> 3.9)
   jekyll-feed (~> 0.12)
+  logger
   monophase
   tzinfo (>= 1, < 3)
   tzinfo-data
   wdm (~> 0.1)
   webrick (~> 1.9)
 
 BUNDLED WITH
-   2.5.11
+   2.6.2