* ci: Build macOS for different architectures separately.
* ci: Combine macOS builds into universal binary.
* ci: Disable uploading final macOS artifacts until ready to resume producing.
* Update deps.sh
GitHub's virtual environment provides 7zip and llvm by default, so brew may fail to install them as another version is already installed
* Use || true to ignore brew installation errors
Try fixing macos build.
2to3 from 2.7 is not really used and is interfering with the
installation of Python 3.9, on which one of ffmpeg's dependencies
depends.
