build(deps): bump @types/koa__router from 12.0.0 to 12.0.3

Bumps [@types/koa__router](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/koa__router) from 12.0.0 to 12.0.3.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/koa__router)

---
updated-dependencies:
- dependency-name: "@types/koa__router"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -25,7 +25,7 @@
     "@koa/router": "^12.0.0",
     "@types/koa": "^2.13.6",
     "@types/koa__cors": "4.0.0",
-    "@types/koa__router": "12.0.0",
+    "@types/koa__router": "12.0.3",
     "koa": "^2.14.2",
     "koa-basic-auth": "^4.0.0",
     "koa-body": "6.0.1",