Bump the jshint esversion.

Review Request #11630 — Created May 27, 2021 and updated

david
Review Board
master
reviewboard

In order to use more modern features, we need to tell jshint not to
freak out. This bumps us up to esversion 9.

Ran jshint and saw that it didn't get upset about async/await.

Summary
Bump the jshint esversion.
Checks run (2 succeeded)
flake8 passed.
JSHint passed.
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