chore: 调整 Dart Sass 的 warnings 配置 (#16604)

Author: koppthe

packages/taro-webpack5-runner/src/webpack/WebpackModule.ts

@@ -104,6 +104,8 @@ export class WebpackModule {
       implementation: require('sass'),
       sassOptions: {
         outputStyle: 'expanded',
+        // https://github.com/sass/dart-sass/blob/main/CHANGELOG.md#js-api
+        silenceDeprecations: ['legacy-js-api'],
         importer (url, prev, done) {
           // 让 sass 文件里的 @import 能解析小程序原生样式文体，如 @import "a.wxss";
           const extname = path.extname(url)