Update dependency pygments.rb to '~> 2.4.0'

Author: renovate[bot]

Gemfile

@@ -34,7 +34,7 @@ end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
-gem 'pygments.rb', '~> 2.3.1'
+gem 'pygments.rb', '~> 2.4.0'
 
 # Performance-booster for watching directories on Windows
 gem "wdm", "~> 0.1.0" if Gem.win_platform?

Gemfile.lock

@@ -133,7 +133,7 @@ GEM
       forwardable-extended (~> 2.6)
     posix-spawn (0.3.15)
     public_suffix (5.0.3)
-    pygments.rb (2.3.1)
+    pygments.rb (2.4.0)
     racc (1.7.1)
     rainbow (3.1.1)
     rake (13.0.6)
@@ -182,7 +182,7 @@ DEPENDENCIES
   jekyll-postfiles
   jekyll-theme-clean-blog!
   jekyll-webmention_io!
-  pygments.rb (~> 2.3.1)
+  pygments.rb (~> 2.4.0)
   rake
   tzinfo-data