Unable to install Ring Plugin v9.21.0
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# Bug Report

### Describe the Bug
<!-- ✍️edit: --> I'm relatively new to Hoobs and am attempting to install the Ring Plugin v9.21.0. After selecting Install to install the plugin on the Hoobs bridge an unexpected error occurs (see below). A notification pops up saying "Plugin Not Installed, unable to install homebridge-ring. View Logs". There are no log entries recorded for the event. 

### To Reproduce
Steps to reproduce the behavior:
 - Log into Hoobs
 - Go to the Plugin Library
 - Select Ring Plugin (certified)
 - Choose to install the plugin on the Hoobs bridge

### Expected behavior
<!-- ✍️edit: --> Plugin is installed.


### Screenshots/Logs
<!-- ✍️edit: --> 
<img width="689" alt="Screen Shot 2021-08-23 at 10 24 32 AM" src="https://user-images.githubusercontent.com/89401349/130479127-063478e6-49db-420f-895f-72ad3f16b532.png">

YARN-ERROR.LOG Information:

Arguments: 
  /usr/bin/node /usr/lib/hoobsd/node_modules/yarn/bin/yarn.js add --unsafe-perm --ignore-engines homebridge-ring@latest hoobs-ring-sidecar

PATH: 
  /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

Yarn version: 
  1.22.10

Node version: 
  14.17.5

Platform: 
  linux arm

Trace: 
  SyntaxError: /usr/local/share/.cache/yarn/v6/npm-rxjs-7.3.0-39fe4f3461dc1e50be1475b2b85a0a88c1e938c6-integrity/node_modules/rxjs/.yarn-m
etadata.json: Unexpected end of JSON input
      at JSON.parse (<anonymous>)
      at /usr/lib/hoobsd/node_modules/yarn/lib/cli.js:1625:59
      at Generator.next (<anonymous>)
      at step (/usr/lib/hoobsd/node_modules/yarn/lib/cli.js:310:30)
      at /usr/lib/hoobsd/node_modules/yarn/lib/cli.js:321:13

npm manifest: 
  {
      "name": "plugins",
      "description": "HOOBS Plugins",
      "private": true,
      "dependencies": {
          "hap-nodejs": "^0.9.4",
          "homebridge-dummy": "^0.5.0",
          "homebridge-myq": "^2.6.5"
      }
  }

yarn manifest: 
  No manifest

:


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

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

HIGHLIGHT THIS TEXT AND POST CONFIG HERE
DO NOT INCLUDE YOUR REFRESH TOKEN OR EMAIL/PASSWORD (replace them with xxx)

```

### Environment
<!-- ✍️edit: -->
 - OS: Raspbian
 - Node.js: v14.17.5
 - NPM: v7.21.0
 - homebridge-ring: v9.21.0
 - homebridge: 1.3.4
 - hoobs: v4.0.100
