DEV: Upgrade Rails to version 7.1

---------

Co-authored-by: Jarek Radosz <jradosz@gmail.com>

spec/requests/application_controller_spec.rb

@@ -326,7 +326,7 @@ RSpec.describe ApplicationController do
 
       expect(log).not_to include("exception app middleware")
 
-      expect(response.parsed_body).to eq("status" => 400, "error" => "Bad Request")
+      expect(response.status).to eq(400)
     end
   end