Re-enable JS side support for older widgets

Was previously disabled to force the install of RC during testing

Author: vidartf

js/package.json

@@ -34,7 +34,7 @@
     "watch": "webpack --mode development -w"
   },
   "dependencies": {
-    "@jupyter-widgets/base": "^6.0.0-rc.0",
+    "@jupyter-widgets/base": "^1.2.5 || ^2.0.0 || ^3.0.0 || ^4.0.0 || ^6.0.0-rc.0",
     "bluebird": "^3.5.5",
     "jupyter-dataserializers": "^3.0.0",
     "three": "^0.97.0",