[CASHTAB] Update the jest dependency

Summary:
Update jest to the latest version. This will allow for creating
coverage report files as needed, which is not supported with current
version.
Note that the collectCoverageFrom regex exclusion has been removed. It
was not matching any file and is very likely broken:
https://github.com/facebook/jest/issues/9464, so it's better to no rely
on it.
The coverage behavior seems to change quite a lot, because it takes into
acount the files with 0 coverage which were previously not accounted
for.

Test Plan:

npm install
npm test
npm run test:coverage

Reviewers: #bitcoin_abc, deadalnix, majcosta

Reviewed By: #bitcoin_abc, deadalnix, majcosta

Subscribers: josephroyking, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D8828