chore(deps): update dependency koa to ^2.15.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
koa	^2.15.0 -> ^2.15.2
@types/koa (source)	2.14.0 -> 2.15.0

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Release Notes

koajs/koa (koa)

### [`v2.15.2`](https://togithub.com/koajs/koa/compare/2.15.1...2.15.2) [Compare Source](https://togithub.com/koajs/koa/compare/2.15.1...2.15.2)

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