macOS Monterey uses port 5000 for new AirPlay service by default
Heads up, in the new OS **macOS Monterey** they added a new service used for AirPlay that listens on port `5000` by default. Not a huge deal to change the port for PostGraphile using `--port` but might be a good idea to change the default from `5000` as it's confusing at first when you get address already in use error. Apple obviously is not going to change from using port `5000` for their AirPlay service.

See https://developer.apple.com/forums/thread/682332 for background.