Fix: await async jwt.verify function

[glensc]

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Description

This looks like bug, to be able to try/catch exception from async function, it must be awaited.

Checklist

• This change adds test coverage for new/changed/fixed functionality
• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not the default branch

[glensc]

The correct base branch is being used, if not the default branch

unclear what this refers to. git branch? I see only master, also no contributing.md in this repo and the org wide file doesn't have details either.

[jfromaniello]

Make sense, published as v8.4.1

[glensc]

Wow. that was fast!

Can you also do (in that order):

• Cleanup: Remove unsupported opts.encoding to JSON.parse node-jws#108
• Fix: Catch errors from JSON.parse node-jws#107
• Fix: jwt.decode doesn't throw, check null instead #321

[glensc]

Changelog not updated:

• https://github.com/auth0/express-jwt/blob/00763facd650da5aa378ed876f4a1e863957642b/CHANGELOG.md