build(deps-dev): bump koa from 2.15.3 to 3.0.0

Bumps [koa](https://github.com/koajs/koa) from 2.15.3 to 3.0.0.
- [Release notes](https://github.com/koajs/koa/releases)
- [Changelog](https://github.com/koajs/koa/blob/master/History.md)
- [Commits](koajs/koa@2.15.3...v3.0.0)

---
updated-dependencies:
- dependency-name: koa
  dependency-version: 3.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -14,7 +14,7 @@
     "raw-body": "^3.0.0"
   },
   "devDependencies": {
-    "koa": "^2.3.0",
+    "koa": "^3.0.0",
     "mocha": "^10.3.0",
     "standard": "^17.1.0",
     "supertest": "^6.3.4"