[Snyk] Security upgrade koa from 1.7.1 to 2.16.1

[fengyun2]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• graphql-lesson03/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Cross-site Scripting (XSS) SNYK-JS-KOA-9679272	508

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