Bump Liquid dependency to v2.5.4
Bump Liquid dependency to v2.5.4

Fix for the replace filter:
https://github.com/Shopify/liquid/pull/173
n060dyz/pages-gem,mstred/pages-gem,jlord/pages-gem,mstred/pages-gem,JustinPatenaude/pages-gem,jlord/pages-gem,JustinPatenaude/pages-gem,n060dyz/pages-gem,Stargator/pages-gem,github/pages-gem,Stargator/pages-gem,github/pages-gem