Bump flow-bin from 0.108.0 to 0.109.0 (#6104)

* Bump flow-bin from 0.108.0 to 0.109.0

Bumps [flow-bin](https://github.com/flowtype/flow-bin) from 0.108.0 to 0.109.0.
- [Release notes](https://github.com/flowtype/flow-bin/releases)
- [Commits](https://github.com/flowtype/flow-bin/compare/v0.108.0...v0.109.0)

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

* Fix flow type to allow undefined (#6113)

package.json

@@ -75,7 +75,7 @@
     "deep-diff": "1.0.2",
     "eslint": "6.5.1",
     "eslint-plugin-flowtype": "4.3.0",
-    "flow-bin": "0.108.0",
+    "flow-bin": "0.109.0",
     "form-data": "2.5.1",
     "gaze": "1.1.3",
     "graphql-tag": "^2.10.1",