Bump jest from 24.8.0 to 24.9.0

Bumps [jest](https://github.com/facebook/jest) from 24.8.0 to 24.9.0.
- [Release notes](https://github.com/facebook/jest/releases)
- [Changelog](https://github.com/facebook/jest/blob/master/CHANGELOG.md)
- [Commits](jestjs/jest@v24.8.0...v24.9.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -23,7 +23,7 @@
     "probot": "^7.3.1"
   },
   "devDependencies": {
-    "jest": "^24.0.0",
+    "jest": "^24.9.0",
     "nock": "^10.0.0",
     "nodemon": "^1.17.2",
     "smee-client": "^1.0.2",