`render()` and `renderSync()` are deprecated for the `sass` package

Hi,

After having created a performance issue for the sass package, I learned that the render() and renderSync() methods were deprecated and suffered from performance issues:

https://github.com/sass/dart-sass/issues/1913#issuecomment-1469070397
https://github.com/sass/dart-sass#legacy-javascript-api

We can also notice it in the comments of the code:

renderSync

render

Ideally, we should suggest a way to use compile() and compileAsync() methods for the following lines:

https://github.com/dlmanning/gulp-sass/blob/c04bb67043fdbcb930152232ee9ba4caff0b2599/index.js#L145

https://github.com/dlmanning/gulp-sass/blob/c04bb67043fdbcb930152232ee9ba4caff0b2599/index.js#L158

Example from sass:

const sass = require('sass');

const result = sass.compile(scssFilename);

// OR

// Note that `compileAsync()` is substantially slower than `compile()`.
const result = await sass.compileAsync(scssFilename);

dlmanning / gulp-sass

`render()` and `renderSync()` are deprecated for the `sass` package #867