Deprecation warning for cache_format_version = 6.1 occurring

[larouxn]

Quick heads up that we have this deprecation warning occurring.

DEPRECATION WARNING: Support for `config.active_support.cache_format_version = 6.1` has been deprecated and will be removed in Rails 7.2.

Check the Rails upgrade guide at https://guides.rubyonrails.org/upgrading_ruby_on_rails.html#new-activesupport-cache-serialization-format
for more information on how to upgrade.
 (called from block in <class:App> at /home/larouxn/src/github.com/larouxn/devdocs/lib/app.rb:60)

Looks like we need to update this line, in some way.

devdocs/lib/app.rb

Line 60 in 9a5b70c

sprockets.cache = ActiveSupport::Cache.lookup_store :file_store, root.join('tmp', 'cache', 'assets', environment.to_s)