Bump react-scripts to v4.0.3

Due to a change in create-react-app in v4.0, eslint errors block React
apps from building. See facebook/create-react-app#9887.
To fix this, v4.0.3 of react-scripts introduces a new flag that disables
eslint. See facebook/create-react-app#10170.
This update allows the app to be built in spite of eslint errors.

package.json

@@ -20,7 +20,7 @@
     "react-draggable": "4.3.1",
     "react-motion": "^0.5.2",
     "react-redux": "^7.2.2",
-    "react-scripts": "4.0.0",
+    "react-scripts": "4.0.3",
     "redux": "^4.0.5",
     "web-vitals": "^0.2.4",
     "workbox-background-sync": "^5.1.3",
@@ -63,12 +63,12 @@
     ]
   },
   "devDependencies": {
-    "react-test-renderer": "^17.0.2",
     "eslint": "^7.23.0",
     "eslint-config-airbnb": "^18.2.1",
     "eslint-plugin-import": "^2.22.1",
     "eslint-plugin-jsx-a11y": "^6.4.1",
     "eslint-plugin-react": "^7.23.1",
-    "eslint-plugin-react-hooks": "^4.2.0"
+    "eslint-plugin-react-hooks": "^4.2.0",
+    "react-test-renderer": "^17.0.2"
   }
 }