Update SCSS to module system (fixes #266)

Change-Id: I2387ef49dadaeac0f62620e0c803df12dad42cf8
diff --git a/package.json b/package.json
index aac2f48..c268e09 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "grunt-terser": "^2.0.0",
     "imagemin": "^9.0.0",
     "optipng-bin": "^9.0.0",
-    "sass": "^1.44.0",
+    "sass": "^1.93.3",
     "vinyl-fs": "^4.0.0"
   },
   "optionalDependencies": {