Pin less to version 4.4.1

Author: depfu[bot]

package.json

@@ -27,7 +27,7 @@
     "async": "^3.0.0",
     "csserror": "^2.0.2",
     "hijackresponse": "^5.0.0",
-    "less": "^4.0.0",
+    "less": "4.4.1",
     "passerror": "^1.1.1"
   },
   "devDependencies": {