switch to using rails 8.0 defaults

Author: ihab4real

config/application.rb

@@ -11,7 +11,7 @@
 module RailsReactTutorial
   class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.
-    config.load_defaults 7.0
+    config.load_defaults 8.0
 
     # Please, add to the `ignore` list any other `lib` subdirectories that do
     # not contain `.rb` files, or that should not be reloaded or eager loaded.