2.22.0

Changes between Bunny 2.21.0 and 2.22.0 (June 12, 2023)

New Connection Callback: :recovery_attempts_exhausted

A new connection callback, :recovery_attempts_exhausted, is invoked when
all allowed recovery attempts have failed.

Contributed by @Schmitze333.

GitHub issue: #666

Bunny::Channel#default_exchange Caching

Bunny::Channel#default_exchange now caches the Bunny::Exchange instance
it returns.

GitHub issue: #661