Deprecated renderSync

Hi,
the `sass.renderSync` within the [styleProcessors](https://github.com/vuejs/component-compiler-utils/blob/master/lib/styleProcessors/index.ts#L33C28-L33C55) has been deprecated. It's advised to use to use `compile` or `compileString`.

```js
const result = nodeSass.renderSync(finalOptions)
```