Update bower.json for version 12.0.0-alpha1

bower.json

@@ -18,10 +18,10 @@
     "tests"
   ],
   "dependencies": {
-    "vaadin-core": "11.0.0-beta1",
-    "vaadin-board": "vaadin-board#2.0.0",
-    "vaadin-charts": "vaadin-charts#6.1.0",
-    "vaadin-confirm-dialog": "vaadin-confirm-dialog#1.0.0",
-    "vaadin-cookie-consent": "vaadin-cookie-consent#1.0.0"
+    "vaadin-core": "vaadin-core#12.0.0-alpha1",
+    "vaadin-board": "vaadin-board#2.1.0-alpha1",
+    "vaadin-charts": "vaadin-charts#6.2.0-alpha1",
+    "vaadin-confirm-dialog": "vaadin-confirm-dialog#1.1.0-alpha1",
+    "vaadin-cookie-consent": "vaadin-cookie-consent#1.1.0-alpha2"
   }
 }