Bump form-data from 2.3.3 to 2.4.0 (#5706)

Bumps [form-data](https://github.com/form-data/form-data) from 2.3.3 to 2.4.0.
- [Release notes](https://github.com/form-data/form-data/releases)
- [Commits](https://github.com/form-data/form-data/commits/v2.4.0)

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

package.json

@@ -74,7 +74,7 @@
     "eslint": "5.16.0",
     "eslint-plugin-flowtype": "3.10.3",
     "flow-bin": "0.101.0",
-    "form-data": "2.3.3",
+    "form-data": "2.4.0",
     "gaze": "1.1.3",
     "husky": "2.4.1",
     "jasmine": "3.4.0",