Bump koa from 2.16.1 to 3.0.3

Bumps [koa](https://github.com/koajs/koa) from 2.16.1 to 3.0.3.
- [Release notes](https://github.com/koajs/koa/releases)
- [Changelog](https://github.com/koajs/koa/blob/master/History.md)
- [Commits](koajs/koa@v2.16.1...v3.0.3)

---
updated-dependencies:
- dependency-name: koa
  dependency-version: 3.0.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]