Bump koa from 2.15.4 to 2.16.1 (#2482)

Bumps [koa](https://github.com/koajs/koa) from 2.15.4 to 2.16.1.
- [Release notes](https://github.com/koajs/koa/releases)
- [Changelog](https://github.com/koajs/koa/blob/master/History.md)
- [Commits](https://github.com/koajs/koa/compare/2.15.4...v2.16.1)

---
updated-dependencies:
- dependency-name: koa
  dependency-version: 2.16.1
  dependency-type: indirect
...

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package-lock.json

@@ -8924,9 +8924,9 @@
       }
     },
     "node_modules/koa": {
-      "version": "2.15.4",
-      "resolved": "https://registry.npmjs.org/koa/-/koa-2.15.4.tgz",
-      "integrity": "sha512-7fNBIdrU2PEgLljXoPWoyY4r1e+ToWCmzS/wwMPbUNs7X+5MMET1ObhJBlUkF5uZG9B6QhM2zS1TsH6adegkiQ==",
+      "version": "2.16.1",
+      "resolved": "https://registry.npmjs.org/koa/-/koa-2.16.1.tgz",
+      "integrity": "sha512-umfX9d3iuSxTQP4pnzLOz0HKnPg0FaUUIKcye2lOiz3KPu1Y3M3xlz76dISdFPQs37P9eJz1wUpcTS6KDPn9fA==",
       "license": "MIT",
       "dependencies": {
         "accepts": "^1.3.5",