Remove sleep from macos homebrew package build

[philipbalinov]

Releasr is eventually consistent & we have a race condition on macos package builds. We sleep() right now as a fix, but should probably switch to polling instead.

          Or we could check for the existence of the mondoo mac pkg, like here for the packer-plugin:

https://github.com/mondoohq/packer-plugin-cnspec/blob/main/.github/workflows/gh-release.yaml#L51-L60

Originally posted by @czunker in #507 (comment)