T6844: Point to new repo for salt-minion package

[MattKobayashi]

Change Summary

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

https://vyos.dev/T6844

Component(s) name

salt-minion

Proposed changes

Broadcom have moved the repository with only a few days notice: https://saltproject.io/blog/upcoming-salt-project-docs-and-repo-migration/. This change points the build script to the new repository, with the exception of the armhf architecture, which is not supported by the new repository and therefore likely needs to be built from source for that architecture.

How to test

Build as normal

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[github-actions]

👍
No issues in PR Title / Commit Title

[c-po]

Thanks for the contribution.

This is superseeded by #829 until we upgrade the salt version.