fix jlab build issues

Author: mbektas

package-lock.json

@@ -45,8 +45,8 @@
     "watch:nbextension": "webpack --watch"
   },
   "dependencies": {
-    "@jupyter-widgets/base": "^3.0.0",
-    "@jupyterlab/apputils": "^2.0.2",
+    "@jupyter-widgets/base": "^2 || ^3",
+    "@jupyterlab/apputils": "^1.2.1",
     "@lumino/algorithm": "^1.2.3",
     "@lumino/commands": "^1.10.1",
     "@lumino/coreutils": "^1.4.2",

package.json

@@ -31,7 +31,7 @@ const EXTENSION_ID = 'jupyter-datagrid:plugin';
 const datagridPlugin: IPlugin<Application<Widget>, void> = {
   id: EXTENSION_ID,
   requires: [IJupyterWidgetRegistry],
-  optional: [IThemeManager],
+  optional: [IThemeManager as any],
   activate: activateWidgetExtension,
   autoStart: true
 };