Allow installation in Rails 7.1

Appraisals

@@ -1,3 +1,8 @@
+appraise 'rails-71' do
+  gem 'actionpack', '~> 7.1.0'
+  gem 'railties', '~> 7.1.0'
+end
+
 appraise 'rails-70' do
   gem 'actionpack', '~> 7.0.0'
   gem 'railties', '~> 7.0.0'