nodejs LTS support for the plugin

[chenrui333]

seeing some warning like this

10:32:30 PM: ❯ Warning: netlify-plugin-submit-sitemap will be executed with Node.js version 18.20.2
10:32:30 PM:   The plugin cannot be executed with your defined Node.js version 10.24.1
10:32:30 PM: ​
10:32:30 PM:   Read more about our minimum required version in our forums announcement
10:32:30 PM: ​
10:32:30 PM: ❯ Loading plugins
10:32:30 PM:    - netlify-plugin-submit-sitemap@0.4.0 from netlify.toml and package.json

https://app.netlify.com/sites/endoflife-date/deploys/662db4f3400af40008a7f952