Update dependency koa-router to v10

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
koa-router	^7.4.0 -> ^10.0.0

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Release Notes

koajs/router

v10.0.0

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• Allow router.redirect() to accept external destinations (#​110) 89b7c02

v9.4.0

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• 99 params request ctx (#​100) 92200d4

v9.1.0

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• Fix current ctx._matchedRoute (#​93) 7030524
• Add test for optional route parameter (#​43) bb74b12

v9.0.1

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• To v9.x.x 🚀 (#​87) e3d5870
• disable package-lock.json (#​83) 53a6e0d
• fix conflict accident per #​75 and koajs/router@11306e1 6131069
• refactor(dependencies): remove urijs dependency (#​75) 5660b68
• feat: replace var with const and let (#​80) 4e44c08
• doc: be more precise about the behavior of middleware on the router (#​82) 90ef8a7
• Fix typo in layer.js (#​28) edb24b4
• Update changelog for wildcard change (#​77) 2e69eca

v8.0.8

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• Fix codes causing infinite loops (#​55) 6f5ff2f

v8.0.7

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• Refactor/for each to forloops (#​50) e07397c

v8.0.6

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• docs: moved "Call for Maintainers" to bottom" 1c08478
• Fix package name (#​41) 2e53c62

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