DEV: Upgrade Rails to version 7.1

---------

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

spec/models/admin_dashboard_data_spec.rb

@@ -42,7 +42,7 @@ RSpec.describe AdminDashboardData do
   end
 
   describe "#problem_message_check" do
-    let(:key) { AdminDashboardData.problem_messages.first }
+    let(:key) { "new_key" }
 
     after { described_class.clear_problem_message(key) }
 

spec/models/user_spec.rb

@@ -678,7 +678,7 @@ RSpec.describe User do
           quoted_post = create_post(user: user, topic: topic, post_number: 1, raw: "quoted post")
           post = create_post(raw: <<~RAW)
             Lorem ipsum
-  
+
             [quote="#{user.username}, post:1, topic:#{quoted_post.topic.id}"]
             quoted post
             [/quote]