Swap Leap 16.0 in for Leap 15.6

[sbradnick]

If we can have Leap 15.6 AND Leap 16.0 (5 total distros), that would be great ⭐

Tumbleweed
SLE 15SP6
SLE 15SP7
Leap 15.6
Leap 16.0

Summary of the Pull Request

PR Checklist

• Closes: Link to issue #xxx
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated if needed and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated if needed
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed