More prep for 0.23.0 release

jupyterlab/package.app.json

@@ -82,6 +82,6 @@
       "@jupyterlab/tooltip-extension"
     ],
     "name": "JupyterLab",
-    "version": "0.23.0rc1"
+    "version": "0.23.0"
   }
 }

jupyterlab/package.json

@@ -82,6 +82,6 @@
       "@jupyterlab/tooltip-extension"
     ],
     "name": "JupyterLab",
-    "version": "0.23.0rc1"
+    "version": "0.23.0"
   }
 }