Fix #9963 reference_filter "Encoding::CompatibilityError" bug with some complex URL;

lib/banzai/filter/reference_filter.rb

@@ -133,7 +133,7 @@ module Banzai
           next unless link && text
-          link = URI.decode(link)
+          link = CGI.unescape(link)
           # Ignore ending punctionation like periods or commas
           next unless link == text && text =~ /\A#{pattern}/
@@ -170,7 +170,7 @@ module Banzai
           text = node.text
           next unless link && text
-          link = URI.decode(link)
+          link = CGI.unescape(link)
           next unless link && link =~ /\A#{pattern}\z/
           html = yield link, text