73051ccde7
PackageCloud is discontinued as of August 18th [1].
Also corrects the versions docs for RabbitMQ and Erlang.
Use new RMQ Cloudsmith repo URLs, these now use
*.rabbitmq.com domains [2].
1. https://www.rabbitmq.com/blog/2024/08/11/package-repository-updates#packagecloud-will-be-discontinued-on-aug-18th-2024
2. https://www.rabbitmq.com/blog/2024/08/11/package-repository-updates#mirrors-now-use-rabbitmqcom-domains
Change-Id: I2cce3dd2540c878878ff0aae80ee5a7e0f455da7
(cherry picked from commit 528b7eef16)