Log Message:
Update net/rabbitmq to 3.6.12.

Core Server
- Process responsible for running the autoheal partition handling
  strategy could run into a deadlock with its peers, preventing autoheal
  from completing.
- Garbage collection of mirrored queue metrics on nodes that did not
  host a master or mirror for a queue affected delivery and
  acknowledgement rates. This could result in rates being 0 or negative
  when they should not be.
- Stats emission could prevent queue mirrors from performing garbage
  collection and consume memory even when they were empty.
- RABBITMQ_SCHEDULER_BIND_TYPE and RABBITMQ_DISTRIBUTION_BUFFER_SIZE now
  can be set via rabbitmq-env.conf.

Shovel Management Plugin
- Passwords in source and destination URIs are now redacted out.

Federation Management Plugin
- Passwords in upstream URIs are now redacted out.