Switch to 7.2 defaults

You can see new settings at [1], they all seem safe for us to switch to.

I'll monitor RAM usage in Heroku after deploying because of the YJIT change.

[1] https://redirect.github.com/rails/rails/blob/v7.2.3.1/railties/lib/rails/generators/rails/app/templates/config/initializers/new_framework_defaults_7_2.rb.tt

Author: zetter-rpf

config/application.rb

@@ -24,7 +24,7 @@
 module App
   class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.
-    config.load_defaults 7.1
+    config.load_defaults 7.2
 
     config.add_autoload_paths_to_load_path = false