Avoid explicitly requiring dependency

With github-pages v232 we also get liquid v4.0.4 (to avoid <jekyll/jekyll#9233>).

Signed-off-by: Pablo Zmdl <pablo@nextcloud.com>

Author: pabzm

Gemfile

@@ -1,8 +1,6 @@
 source 'https://rubygems.org'
-gem 'github-pages'
-
-# Explicitly require v4.0.4 to fix "Liquid Exception: undefined method 'tainted?' for an instance of String". See <https://github.com/jekyll/jekyll/issues/9233>.
-gem 'liquid', '>=4.0.4'
+# Explicitly require >=232 to make sure liquid >=4.0.4 is used, which has a fix for "Liquid Exception: undefined method 'tainted?' for an instance of String". See <https://github.com/jekyll/jekyll/issues/9233>.
+gem 'github-pages', '>=232'
 
 # Require some gems that are not part of the core anymore in recent Ruby versions.
 gem 'csv'