Update @koa/cors requirement from 2.2.2 to 2.2.3

Updates the requirements on [@koa/cors](https://github.com/koajs/cors) to permit the latest version.
- [Release notes](https://github.com/koajs/cors/releases)
- [Changelog](https://github.com/koajs/cors/blob/master/History.md)
- [Commits](https://github.com/koajs/cors/commits/2.2.3

)

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