Worker is dead term

[pboling]

🐛 Queue always nil in default_retries_exhausted_message

• worker is no longer used in most scenarios
  • See: https://github.com/sidekiq/sidekiq/wiki/Best-Practices#4-use-precise-terminology
• keys are string, symbol lookups fail
• Add red/green test

[pboling]

It's worth noting that this gem uses the worker term (as Sidekiq::Worker) in other places as well, and that is outdated, although still supported.

https://github.com/sidekiq/sidekiq/discussions/4971#discussioncomment-1216694 https://github.com/sidekiq/sidekiq/discussions/4971#discussioncomment-1216697