Update rabbitmq
Update rabbitmq

Changes:

- https://github.com/docker-library/rabbitmq/commit/bca6e73: Update to 3.7.24, Erlang/OTP 22.3, OpenSSL 1.1.1f
- https://github.com/docker-library/rabbitmq/commit/904c509: Update to 3.8.3, Erlang/OTP 22.3, OpenSSL 1.1.1f
- https://github.com/docker-library/rabbitmq/commit/0b47a9f: Merge pull request https://github.com/docker-library/rabbitmq/pull/394 from gerhard/default-to-python3
- https://github.com/docker-library/rabbitmq/commit/28ec81f: Handle Python v2 vs v3 requirement via update.sh Plain python defaults to v2 & it fails with:

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