Update rabbitmq
Update rabbitmq

Changes:

- https://github.com/docker-library/rabbitmq/commit/a3018ad: Update to 3.7.18, Erlang/OTP 22.1, OpenSSL 1.1.1d
- https://github.com/docker-library/rabbitmq/commit/1a66e87: Update to 3.8.0-rc.1, Erlang/OTP 22.1, OpenSSL 1.1.1d
- https://github.com/docker-library/rabbitmq/commit/eb9d525: Update to 3.7.18, Erlang/OTP 22.0.7, OpenSSL 1.1.1d
- https://github.com/docker-library/rabbitmq/commit/11b0f43: Update to 3.7.18-rc.1, Erlang/OTP 22.0.7, OpenSSL 1.1.1d

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