chore(deps): update dependency koa to v2.15.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
koa	2.13.4 -> 2.15.3
@types/koa (source)	2.13.5 -> 2.15.0

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Release Notes

koajs/koa (koa)

v2.15.3

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v2.15.2

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v2.15.1

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v2.15.0

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v2.14.2

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v2.14.1

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v2.14.0

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