Getting a lot of 504 errors after updating to 9.18.4/9.18.5
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# Bug Report

### Describe the Bug
<!-- ✍️edit: --> Getting the following in the logs after updating from 9.18.2 to 9.18.5  today. "ERRORRequest to https://api.ring.com/clients_api/dings/active failed with status 504. Response body: {"error":"Gateway Timeout","status_code":504}"

### To Reproduce
Steps to reproduce the behavior:
No particular steps.
I have tried rebooting the system and restarting just the bridge as well, but no change.
It seems to happen intermittently.
Devices appear to be online and working though.

### Expected behavior
<!-- ✍️edit: --> A clear and concise description of what you expected to happen.


### Screenshots/Logs
<!-- ✍️edit: --> If applicable, add screenshots and log output to help explain your problem.

### Additional context
<!-- ✍️edit: --> Add any other context about the problem here.

### Homebridge Ring Config
Post homebridge-ring platform config  _without sensitive information_
```

{
    "accessories": [],
    "platforms": [
        {
            "platform": "Ring",
            "refreshToken": "xxx",
            "hideUnsupportedServices": true
        }
    ]
}

```

### Environment
<!-- ✍️edit: -->
 - OS: Raspbian
 - Node.js: 14.7.2
 - NPM: [e.g 6.13.4] <!-- run `npm -v` to get current version -->
 - homebridge-ring: 9.18.5
 - homebridge: N/A
 - hoobs: 4.0.92
