Add dalli gem to prevent warnings from idenity_cache

[larouxn]

Motivation

Proposing we add dalli to our Gemfile to prevent the following warnings from appearing in CI logs.

You don't have dalli installed in your application. Please add it to your Gemfile and run bundle install

Confirmed the above warning appears in all CI run logs for all Ruby/Rails versions by downloading the logs from a recent successful CI run and grep-ing over them for the above warning with the following.

grep -n "dalli" /home/larouxn/Downloads/logs_55022312394/*.txt

Inspired by #2155 (comment), as I believe identity_cache may be the source of the warnings re: it uses dalli.

Implementation

1. Add dalli to Gemfile
2. bundle install

Tests

I have confirmed the warning no longer appears in logs when dalli is present in the Gemfile.

https://github.com/larouxn/tapioca/actions/runs/21225302153