[Bug] When JWT verification fails the faucet returns 500 but should return 4xx

[banool]

🐛 Bug

A clear and concise description of what the bug is.
To report a security issue, please email [email protected].

To reproduce

Make a request to the faucet with an invalid JWT, you will see a response like this with a 500 status code:

{
    "message": "Error(46): Failed to verify JWT token: []",
    "error_code": "CheckerError",
    "rejection_reasons": [],
    "txn_hashes": []
}

Expected Behavior

The user gets the same error body but with a 4xx instead.

System information

N/A

Additional context

Add any other context about the problem here.

[VesperQuartz]

How do you get valid JWT token?

[banool]

You must use https://aptos.dev/network/faucet.