Update rabbitmq
Update rabbitmq

Changes:

- https://github.com/docker-library/rabbitmq/commit/bb688c9: Merge pull request https://github.com/docker-library/rabbitmq/pull/384 from J0WI/alpine11
- https://github.com/docker-library/rabbitmq/commit/4a6c258: Upgrade Alpine to 3.11

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