Update Package.json to specify Node 20

[mslinnea]

Description

This plugin was updated to Node 20 in #112 but the package.json engines still allow Node 16. This plugin is flagged in a Node 20 audit due to this issue, so to resolve we should update package.json to reflect Node 20. Check if any other changes are needed.

Update this:

"engines": {
    "node": ">=16 <=20",
    "npm": ">=8 <=10"
  },```

### Use Case

As a developer, I want the correct engines specified in package.json.