fix(deps): update react monorepo to v16.12.0

Author: renovate-bot

package-lock.json

@@ -8,8 +8,8 @@
     "lodash.debounce": "4.0.8",
     "luxon": "1.12.1",
     "prop-types": "15.7.2",
-    "react": "16.8.6",
-    "react-dom": "16.8.6",
+    "react": "16.12.0",
+    "react-dom": "16.12.0",
     "react-redux": "^7.0.3",
     "react-router-dom": "5.0.1",
     "react-scripts": "3.0.0",