Bump koa-router from 8.0.8 to 9.0.1

Bumps [koa-router](https://github.com/koajs/router) from 8.0.8 to 9.0.1.
- [Release notes](https://github.com/koajs/router/releases)
- [Changelog](https://github.com/koajs/router/blob/master/history.md)
- [Commits](koajs/router@v8.0.8...v9.0.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -33,7 +33,7 @@
     "dog-names": "^2.0.0",
     "ioredis": "^4.17.3",
     "koa": "^2.12.0",
-    "koa-router": "^8.0.8",
+    "koa-router": "^9.0.1",
     "koa-static": "^5.0.0",
     "mz": "^2.7.0",
     "relative-date": "^1.1.3",