chore(deps): update dependency koa to v2.16.4 [security]

Author: renovate[bot]

package-lock.json

@@ -57,7 +57,7 @@
     "graphql": "16.10.0",
     "jest": "29.7.0",
     "jest-junit": "16.0.0",
-    "koa": "2.16.0",
+    "koa": "2.16.4",
     "koa-bodyparser": "4.4.1",
     "prettier": "3.5.3",
     "supertest": "6.3.4",