Update dependencies for version 15.0.0-alpha12

package.json

@@ -9,7 +9,7 @@
     "@webcomponents/shadycss": "^1.8.0",
     "@vaadin/vaadin-accordion": "^1.0.1",
     "@vaadin/vaadin-button": "^2.2.1",
-    "@vaadin/vaadin-checkbox": "^2.2.10",
+    "@vaadin/vaadin-checkbox": "^2.2.12",
     "@vaadin/vaadin-combo-box": "^5.0.9",
     "@vaadin/vaadin-context-menu": "^4.3.15",
     "@vaadin/vaadin-control-state-mixin": "^2.1.3",
@@ -51,7 +51,7 @@
     "@vaadin/vaadin-text-field": "^2.5.3",
     "@vaadin/vaadin-themable-mixin": "^1.5.2",
     "@vaadin/vaadin-upload": "^4.2.2",
-    "@vaadin/vaadin-custom-field": "^1.0.9",
+    "@vaadin/vaadin-custom-field": "^1.0.10",
     "@vaadin/vaadin-app-layout": "^2.0.4",
     "@vaadin/vaadin-login": "^1.0.1",
     "@vaadin/vaadin-usage-statistics": "^2.1.0",