chore(deps-dev): bump koa in the dependencies group (#2027)

Bumps the dependencies group with 1 update: [koa](https://github.com/koajs/koa).


Updates `koa` from 2.15.3 to 2.15.4
- [Release notes](https://github.com/koajs/koa/releases)
- [Changelog](https://github.com/koajs/koa/blob/master/History.md)
- [Commits](https://github.com/koajs/koa/commits)

---
updated-dependencies:
- dependency-name: koa
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

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Author: dependabot[bot]