More random upgrades to fix vulnerabilities.

I've lost track of which packages are getting upgraded here:
things under @babel, @firebase, @jest, yargs, much more.
This stuff is the worst.

I had to back off on some Jest upgrades since they caused
(bogus?) "Do not import `@jest/globals` outside of the Jest
test environment" errors in src/firebase/mock.ts that I
couldn't find any way to fix.

After doing this, downgrade @firebase/testing to 0.15.0,
since otherwise the Firestore rules tests fail due to this
bug reported 8 days ago:
firebase/firebase-js-sdk#3096

Sigh.

Author: derat