Rails deprecation and security warnings

Hi,

I see many deprecation and security warnings on my latest log check after a docker pull-compose up:

docker logs office-openproject-1
DEPRECATION WARNING: ActiveSupport::Configurable is deprecated without replacement, and will be removed in Rails 8.2.

You can emulate the previous behavior with `class_attribute`.
 (called from <top (required)> at /app/config/application.rb:44)
=> Booting Puma
=> Rails 8.1.2 application starting in production
=> Run `bin/rails server --help` for more startup options
I, [2026-03-12T15:22:49.979331 #1]  INFO -- : Increasing database pool size to 17 to match max threads
W, [2026-03-12T15:22:56.240658 #1]  WARN -- : SECURITY WARNING: Dalli is using Marshal for serialization. Marshal can execute arbitrary code during deserialization. If your memcached server could be compromised, consider using a safer serializer like JSON: Dalli::Client.new(servers, serializer: JSON)
W, [2026-03-12T15:23:40.641179 #1]  WARN -- : Generating image variants require the image_processing gem. Please add `gem "image_processing", "~> 1.2"` to your Gemfile or set `config.active_storage.variant_processor = :disabled`.
[1] Puma starting in cluster mode...

Hope they're being managed.

Read config/application.rb:44 and the Gemfile, then reproduce the warnings with docker logs office-openproject-1 after the reported Compose startup. Trace the ActiveSupport, Dalli, and Active Storage warnings; done means each reported warning has a documented or verified resolution without introducing new startup warnings.