change apt-key because of deprecation

[Spirit-act]

Replace apt_key with an get_url and modified repo sources

Description

The apt-key functionality was deprecated and will be removed after ubuntu 24.04 and debian 12.

The simple solution is to download the key and work with the signed-by tag within the source list. I followed the installation guide from the official rabbitmq docs.

I also updated the rabbitmq-server version.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (non-breaking change that does not add functionality or fix an issue)

Checklist:

• I have read the CONTRIBUTING document.
• I have run the pre-merge tests locally and they pass.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

---

I have a few questions about the Checklist:

• What are the pre-merge tests? I have not found any.
• I don't know what I should document an therefor I am not sure if I should check the point.
• I have never worked with molecule and I do not see any tests which I could follow

After all I can say, I have deployed a RabbitMQ Cluster with these changes.

If anything should be changes, please make a comment.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Spirit-act]

I think the changes are still valid.