chore!: upgrade koa/router package

[jeengbe]

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you written unit tests?
• Have you written unit tests that cover the negative cases (i.e.: if bad data is submitted, does the library respond properly)?
• This PR is associated with an existing issue?

Closing issues

Closes #1817

Potential Problems With The Approach

This will require users to upgrade @types/koa__router -> @koa/router, which may include breaking changes outside the direct scope of tsoa - e.g. in the context or request object.

Test plan

[github-actions]

Hello there jeengbe 👋

Thank you and congrats 🎉 for opening your first PR on this project.✨

We will review the following PR soon! 👀

[jeengbe]

Perhaps I need to bump the versions for the tests to work in CI? They run just fine locally.

[jeengbe]

I have no idea why this doesn't work. Have you seen this before, WoH?