Merge pull request #2496 from alphagov/use-new-cache-format-version

Upgrade Rails cache format version to 7.1

config/application.rb

@@ -23,10 +23,7 @@ class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.
     config.load_defaults 7.1
 
-    # Once this application is fully deployed to Rails 7.1 and you have no plans to rollback
-    # replace the line below with config.active_support.cache_format_version = 7.1
-    # This will mean that we can revert back to rails 7.0 if there is an issue
-    config.active_support.cache_format_version = 7.0
+    config.active_support.cache_format_version = 7.1
 
     # 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.