chore(package): update gulp-sass to version 4.0.0 (#2943)

package.json

@@ -107,7 +107,7 @@
     "gulp-replace": "~0.6.1",
     "gulp-replace-task": "~0.11.0",
     "gulp-rev-all": "~0.9.7",
-    "gulp-sass": "~3.2.0",
+    "gulp-sass": "~4.0.0",
     "gulp-sass-lint": "~1.3.4",
     "gulp-size": "~3.0.0",
     "gulp-sourcemaps": "~2.6.1",