Update GitHub Actions to use macos-latest and install mono

[corbob]

Checklist

• I confirm there are no unresolved issues reported on the Chocolatey Status page.
• I have verified this is the correct repository for opening this issue.
• I have verified no other issues exist related to my problem.
• I have verified this is not an issue for a specific package.
• I have verified this issue is not security related.
• I confirm I am using official, and not unofficial, or modified, Chocolatey products.

What You Are Seeing?

Builds for MacOS were failing in GitHub Actions. As GitHub recently moved macos-latest to be macos-15, which drops mono from the build agent.

What is Expected?

MacOS builds should work on macos-latest.

How Did You Get This To Happen?

Just let GitHub Actions run for some PRs and other commits.

System Details

GitHub Actions MacOS build.

Installed Packages

N/A

Output Log

N/A

Additional Context

We have temporarily worked around this failure in 17682ea by pinning to macos-14. This is not a complete fix as macos-14 at some point will go away, and we should update to either macos-15 or macos-latest before then.

[github-actions]

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