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](flow/flow-bin@v0.108.0...v0.109.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

* Fix flow type to allow undefined (#6113)

Author: dependabot-preview[bot]

package-lock.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",

package.json

@@ -131,7 +131,7 @@ export class MongoStorageAdapter implements StorageAdapter {
   _collectionPrefix: string;
   _mongoOptions: Object;
   // Public
-  connectionPromise: Promise<any>;
+  connectionPromise: ?Promise<any>;
   database: any;
   client: MongoClient;
   _maxTimeMS: ?number;

src/Adapters/Storage/Mongo/MongoStorageAdapter.js

@@ -556,7 +556,7 @@ export default class SchemaController {
   _dbAdapter: StorageAdapter;
   schemaData: { [string]: Schema };
   _cache: any;
-  reloadDataPromise: Promise<any>;
+  reloadDataPromise: ?Promise<any>;
   protectedFields: any;
 
   constructor(databaseAdapter: StorageAdapter, schemaCache: any) {