Upgrade gulp-sass to v5

Author: BafS

gulpfile.js

@@ -1,6 +1,6 @@
 const { watch, series, src, dest } = require('gulp');
 const rename = require('gulp-rename');
-const sass = require('gulp-sass');
+const sass = require('gulp-sass')(require('sass'));
 const tildeImporter = require('node-sass-tilde-importer');
 
 const buildCss = () => {