CI: Add brute-force workaround for macOS disk image creation failure

Suggestion by GitHub's macOS image maintainer is to kill
XProtectBehaviourService when "Resource busy" error occurs on macOS 13
runners.
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f