Update activerecord to match activesupport

Author: jacobbednarz

actionpack-action_caching.gemspec

@@ -17,5 +17,5 @@ Gem::Specification.new do |gem|
   gem.add_dependency "actionpack", ">= 4.0.0", "< 7"
 
   gem.add_development_dependency "mocha"
-  gem.add_development_dependency "activerecord", ">= 4.0.0", "< 6"
+  gem.add_development_dependency "activerecord", ">= 4.0.0", "< 7"
 end