Bump koa-router from 9.1.0 to 9.4.0

Bumps [koa-router](https://github.com/koajs/router) from 9.1.0 to 9.4.0.
- [Release notes](https://github.com/koajs/router/releases)
- [Changelog](https://github.com/koajs/router/blob/master/history.md)
- [Commits](koajs/router@v9.1.0...v9.4.0)

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": "^2.13.0",
-    "koa-router": "^9.1.0",
+    "koa-router": "^9.4.0",
     "koa-static": "^5.0.0",
     "mz": "^2.7.0",
     "relative-date": "^1.1.3",