Update ts-jest to the latest version � (#768)

Summary:
## The devDependency [ts-jest](https://github.com/kulshekhar/ts-jest) was updated from `24.3.0` 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:** [kul](https://www.npmjs.com/~kul)
**License:** MIT

[Find out more about this release](https://github.com/kulshekhar/ts-jest).

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  <summary>FAQ and help</summary>

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Your [Greenkeeper](https://greenkeeper.io) bot 🌴
Pull Request resolved: https://github.com/facebook/flipper/pull/768

Reviewed By: mweststrate

Differential Revision: D19639975

Pulled By: passy

fbshipit-source-id: d3e344d54d76127476c42146e2cc6c4c578d89c8

package.json

@@ -107,7 +107,7 @@
     "prettier": "^1.19.1",
     "react-async": "^10.0.0",
     "redux-mock-store": "^1.5.3",
-    "ts-jest": "^24.1.0",
+    "ts-jest": "^25.1.0",
     "typescript": "^3.7.2"
   },
   "dependencies": {