Eliminate Rails 7 warning about Active Record legacy connection handling

DEPRECATION WARNING: Using legacy connection handling is deprecated.
    Please set `legacy_connection_handling` to `false` in your application.

test/rails_app/config/application.rb

@@ -49,5 +49,9 @@ module RailsApp
     if Devise::Test.rails52_and_up? && !Devise::Test.rails6_and_up?
       Rails.application.config.active_record.sqlite3.represent_boolean_as_integer = true
     end
+
+    if Devise::Test.rails7_and_up?
+      config.active_record.legacy_connection_handling = false
+    end
   end
 end

test/rails_app/config/boot.rb

@@ -8,6 +8,10 @@ module Devise
   module Test
     # Detection for minor differences between Rails versions in tests.
 
+    def self.rails7_and_up?
+      Rails::VERSION::MAJOR >= 7
+    end
+
     def self.rails6_and_up?
       Rails::VERSION::MAJOR >= 6
     end