[REQUIRED] Environment info

firebase-tools: 9.6.1

Platform: macOS

[REQUIRED] Test case

A project with all the emulators enabled (hosting, pubsub, functions, database, ui) - a good example is https://github.com/Hacksore/firebase-shell-bug

[REQUIRED] Steps to reproduce

See: https://github.com/Hacksore/firebase-shell-bug/blob/master/README.md

[REQUIRED] Expected behavior

I should be able to get the functions shell REPL while the hosting emulator is running.

[REQUIRED] Actual behavior

When all emulators are running via firebase emulators:start you will get a connection error when attempting to firebase functions:shell

Error: Port 5000 is not open on localhost, could not start functions emulator.