Upgrade koa to 2.15.4 for security reason

[e-hosseini]

Summary
Koa uses an evil regex to parse the X-Forwarded-Proto and X-Forwarded-Host HTTP headers. This can be exploited to carry out a Denial-of-Service attack. It was fixed in version 2.15.4

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Latest commit: 64075ef

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[cnairi]

Thanks for this very useful PR 🙏

[tajo]

duplicate #600