Add psych to the bug report template

With release of psych 5.1.1.1 bundler doesn't know which version to
load.

https://buildkite.com/rails/rails/builds/100852

Author: rafaelfranca

guides/bug_report_templates/action_controller_gem.rb

@@ -9,6 +9,7 @@
 
   # Activate the gem you are reporting the issue against.
   gem "rails", "~> 7.1.0"
+  gem "psych"
 end
 
 require "rack/test"