CI: Silence Homebrew trust warnings by untapping aws

[shinra-electric]

This silences 8 warnings generated by homebrew.

Aws is pre-installed in the Github runner, and should not be required for building Aegisub.

[arch1t3cht]

Looks like this is being reported and addressed upstream in actions/runner-images#14271 so I'd wait for a bit and see if that fix is merged or applied soon. If this warning persists for a longer time, we can add a downstream workaround.

[shinra-electric]

In that case, I've converted to draft for now.

[shinra-electric]

There is another repeated warning that was caused by this commit.

It was a workaround for this issue, but it looks like it has been resolved.

[arch1t3cht]

I had another look at that warning too yesterday. From my very quick read through that issue it seemed like it hadn't yet been resolved for older runner images (see actions/runner-images#9966 (comment) ), but I've been meaning to just try this out myself.

Either way, the linked thread also contains alternative workaround that don't cause the warning in question, so it might be worth switching to one of those.