chore(package): update react-dnd-test-backend to version 11.1.1

Closes #95

Author: greenkeeper[bot]

package.json

@@ -55,7 +55,7 @@
     "enzyme-adapter-react-16": "^1.15.2",
     "enzyme-to-json": "^3.4.4",
     "fetch-mock": "^9.4.0",
-    "react-dnd-test-backend": "^7.7.0",
+    "react-dnd-test-backend": "^11.1.1",
     "react-dnd-test-utils": "^7.4.4",
     "react-scripts": "^3.3.1",
     "redux-mock-store": "^1.5.4"