Update dependencies for version 14.1.0-rc1

bower.json

     "update-core-version.js"
   ],
   "dependencies": {
-    "vaadin-core": "14.1.0-beta3",
+    "vaadin-core": "vaadin-core#14.1.0-rc1",
     "vaadin-board": "vaadin-board#2.1.1",
     "vaadin-charts": "vaadin-charts#6.2.4",
     "vaadin-confirm-dialog": "vaadin-confirm-dialog#1.1.5",

package.json

   "license": "(Apache-2.0 OR SEE LICENSE IN https://vaadin.com/license/cval-3.0)",
   "main": "vaadin.js",
   "dependencies": {
-    "@vaadin/vaadin-core": "^14.1.0-beta3",
+    "@vaadin/vaadin-core": "^14.1.0-rc1",
     "@vaadin/vaadin-board": "^2.1.1",
     "@vaadin/vaadin-charts": "^6.2.4",
     "@vaadin/vaadin-confirm-dialog": "^1.1.5",