Update babel to the latest stable.

Review Request #11628 — Created May 27, 2021 and updated

david
Djblets
master
djblets

This is a minor version bump to use the latest babel 7.x

Reloaded everything and ran js-tests.

Summary
Update babel to the latest stable.
Checks run (2 succeeded)
flake8 passed.
JSHint passed.
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