Update rabbitmq
Update rabbitmq

Changes:

- https://github.com/docker-library/rabbitmq/commit/2dffcb0: Update to 3.7.26, Erlang/OTP 22.3.3, OpenSSL 1.1.1g
- https://github.com/docker-library/rabbitmq/commit/7ac7589: Merge pull request https://github.com/docker-library/rabbitmq/pull/406 from docker-library/github-actions
- https://github.com/docker-library/rabbitmq/commit/7bfcac9: Add initial GitHub Actions CI

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