update @koa/router for koa2

Author: jcolekaplan

koa2/package.json

@@ -25,7 +25,7 @@
   },
   "dependencies": {
     "@contrast/test-bench-utils": "^3.38.0",
-    "@koa/router": "^8.0.8",
+    "@koa/router": "^12.0.0",
     "koa": "^2.12.0",
     "koa-bodyparser": "^4.2.1",
     "koa-cookie": "^1.0.0",