Update jest version to latest (#1858)

Summary:
**Summary**
Follow-up to #1724. Ran `yarn add jest@latest` to update to the latest Jest version.

**Test Plan**
```
npm run test
yarn run test
```
Pull Request resolved: #1858

Differential Revision: D9762740

fbshipit-source-id: 28a0bf01d103f835240d29fbb980dd586386de5f

Author: niveditc

meta/bundle-size-stats/Draft.js.json

@@ -72,7 +72,7 @@
     "gulp-rename": "^1.2.2",
     "gulp-uglify": "^1.2.0",
     "gulp-util": "^3.0.6",
-    "jest": "^21.2.1",
+    "jest": "^23.5.0",
     "prettier": "1.13.6",
     "react": "^16.0.0",
     "react-dom": "^16.0.0",