🤖 Merge PR #48622 koa: fix: Callback type to be compatible with node by @kf6kjg
🤖 Merge PR #48622 koa: fix: Callback type to be compatible with node by @kf6kjg

See definition of RequestListener at https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/node/http.d.ts#L115

The actual Koa code at https://github.com/koajs/koa/blob/master/lib/application.js#L168 does return a promise, but one that's already had both `then` and `catch` called upon it.
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