replace on-finished with node:stream's finished

[bjohansebas]

This is part of supporting HTTP/2 within Express and also using native APIs.

I'm not sure if this is a breaking change. All tests are passing, although errors could change, so I would say it might be a breaking change. What do you think?

[bmuenzenmeyer]

I'm not sure if this is a breaking change. All tests are passing, although errors could change, so I would say it might be a breaking change. What do you think?

My unsolicited opinion / logic is as follows:

if the only thing someone does is upgrade express, and their CI breaks, it's a major. The error is part of the public API.

[bjohansebas]

if the only thing someone does is upgrade express, and their CI breaks, it's a major. The error is part of the public API.

But the middleware could depend on that error, because there could be middleware that depends on it—not the ones maintained by Express, but surely someone could be relying on it.