config.yml: Update Bootstrap and Bootswatch to latest

Author: gonX

site/Gemfile

@@ -18,8 +18,8 @@ group :jekyll_plugins do
 end
 
 gem 'json'
-gem "bootswatch", github: "thomaspark/bootswatch", tag: "v5.3.3"
-gem "bootstrap", "~> 5.3.3"
+gem "bootswatch", github: "thomaspark/bootswatch", tag: "v5.3.6"
+gem "bootstrap", "~> 5.3.5"
 
 # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
 # and associated library.