chore(deps): update dependency koa to v3.1.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
koa (source)	3.0.3 -> 3.1.1
@types/koa (source)	3.0.0 -> 3.0.1

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Release Notes

koajs/koa (koa)

v3.1.1

Compare Source

What's Changed

• fix: only original value destroy if the new value is not a stream by @​yowainwright in #​1914

Full Changelog: koajs/koa@v3.1.0...v3.1.1

v3.1.0

Compare Source

==================

fixes

• [2ee32f5] - fix: pin debug@~3.1.0 avoid deprecated warnning (#​1245) (fengmk2 <<fengmk2@​gmail.com>>)

others

• [2180839] - docs: Update koa-vs-express.md (#​1230) (Clayton Ray <iamclaytonray@gmail.com>)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (bdecc04) to head (a4b58fb).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2936   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            8         8           
  Lines          683       683           
  Branches       162       162           
=========================================
  Hits           683       683           

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