ci(renovate): fix config warnings

[jcfranco]

Related Issue: N/A

Summary

Fixes the following warning found when validating the config:

WARN: Found errors in configuration
"file": ".renovaterc.json",
  "warnings": [
  {
    "topic": "Configuration Warning",
    "message": "packageRules[1].extends: you should not extend \"group:\" presets"
  },
  {
    "topic": "Configuration Warning",
    "message": "packageRules[1].extends: you should not extend \"group:\" presets"
  },
  {
    "topic": "Configuration Warning",
    "message": "packageRules[2].extends: you should not extend \"group:\" presets"
  },
  {
    "topic": "Configuration Warning",
    "message": "packageRules[2].extends: you should not extend \"group:\" presets"
  },
  {
    "topic": "Configuration Warning",
    "message": "packageRules[5].extends: you should not extend \"group:\" presets"
  },
  {
    "topic": "Configuration Warning",
    "message": "packageRules[7].extends: you should not extend \"group:\" presets"
  }
]

[isaacbraun]

🚀