fix: unit tests failed due to 'tslib' missing

[DannySu09]

Checklist

• npm test passes
• tests are included
• documentation is changed or added
• commit message follows commit guidelines

Description of change

Tried to run unit tests and found two were failed due to the same reason:

After installing tslib, seems everything works fine:

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Latest commit: 466e918

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[kuitos]

CI竟然一直是好的，有点怪

[kuitos]

看了一下，之前的 CI 也是 ok 的，感觉是你本地 ts 版本的问题？
不过 review 发现 tslib 是没必要开的 https://github.com/umijs/qiankun/blob/master/tsconfig.json#L9 ，感谢提醒~