chore(package): update @types/jest to version 25.1.0

[greenkeeper]

The devDependency @types/jest was updated from 24.9.1 to 25.1.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Publisher: types
License: MIT

Find out more about this release.

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[agilgur5]

A few questions/concerns:

• TSDX still uses Jest v24 -- why were the types updated?
• Jest v24.3+ has types built-in, is @types/jest still necessary?
• The package.json was updated, but not the yarn.lock file -- can PR a fix to this but not sure I should based on the above

EDIT: I think the lockfile is the result of the error in https://github.com/jaredpalmer/tsdx/pull/466/checks?check_run_id=414995509

[swyxio]

hmm.. my bad. didnt think it through.