chore(deps): update dependency acorn to v0.12.0

Author: renovate[bot]

package-lock.json

@@ -53,7 +53,7 @@
     "./dist/node/extend.js": false
   },
   "devDependencies": {
-    "acorn": "0.5.0",
+    "acorn": "0.12.0",
     "canvas": "2.11.2",
     "del": "4.1.1",
     "gulp": "3.9.1",