Koa 2.x still broken in v1.1.2

[Referencing https://github.com/inspect-js/is-generator-function/issues/45](https://github.com/inspect-js/is-generator-function/issues/45#issuecomment-3349795598)

I am currently trying to debug the issue, I am still getting the "is not a function" error and reverting to v1.1.0 resolves the issue. I am unsure what the issue with the import of the generator-function package is, its transpiled and minified in an ancient build pipeline so its really hard to debug.

I will post updates when i find out more…