Update Jest to no longer take a dependency on 'merge'

[eljefe223]

jest takes a devDependency on exec-sh which takes a dependency on merge.

merge has a security vulnerability in versions before 1.2.0.

exec-sh has removed the dependency on merge here

Here is the the issue on Jest to update their dependency on exec-sh.

Once available we will need to version bump jest

[stale]

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