fix: move @types/jest to dependencies to work well with yarn 2

[ahnpnl]

Summary

Because we export mocked, a util function, as a public function but we also refer to @types/jest here which isn’t complied with yarn 2

This PR moves @types/jest to dependencies list.

Fixes #1857

Test plan

Pack a tgz file and install with yarn 2 to the project in #1857

Does this PR introduce a breaking change?

• Yes
• No

Other information

N.A.

[coveralls]

Pull Request Test Coverage Report for Build 5577

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.989%

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Totals
Change from base Build 5576:	0.0%
Covered Lines:	1093
Relevant Lines:	1128

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💛 - Coveralls