Bump pygments to 3.0.0 to hopefully fix recent error

Author: marceltaeumel

Gemfile

@@ -6,6 +6,6 @@ gem 'jekyll-redirect-from', '0.14.0'
 gem 'jekyll-scholar', '5.14.1'
 gem 'jekyll-seo-tag', '2.5.0'
 gem 'jekyll-sitemap', '1.2.0'
-gem 'pygments.rb', '1.2.0'
+gem 'pygments.rb', '3.0.0'
 gem 'rake', '>= 12.3.3'
 gem 'unicode'