build(deps-dev): bump koa from 2.14.1 to 2.14.2 (#219)

Bumps [koa](https://github.com/koajs/koa) from 2.14.1 to 2.14.2.
- [Release notes](https://github.com/koajs/koa/releases)
- [Changelog](https://github.com/koajs/koa/blob/2.14.2/History.md)
- [Commits](koajs/koa@2.14.1...2.14.2)

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

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