saoimageds9: deprecate unsigned

[krehel]

Important: Do not tick a checkbox if you haven’t performed its action. Honesty is indispensable for a smooth review process.

In the following questions <cask> is the token of the cask you're submitting.

After making any changes to a cask, existing or new, verify:

• The submission is for a stable version or documented exception.
• brew audit --cask --online <cask> is error-free.
• brew style --fix <cask> reports no offenses.

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[krehel]

Wondering how CI is thinking it is signed on macos-14. App is not signed. Upstream also refers to use xattr to adjust attributes.

[bevanjkay]

I don't think gktool is working correctly on the Sonoma runners, but we can't defer back to the other check, because it can be inconsistent with gktool.

[p-linnane]

Not worth spending time debugging to disable this cask. I doubt we'll get any meaningful updates to gktool in Sonoma.