chore: use beta kb nav in advanced playground (#9369)

Author: maribethb

package-lock.json

@@ -102,7 +102,7 @@
   "devDependencies": {
     "@blockly/block-test": "^7.0.2",
     "@blockly/dev-tools": "^9.0.2",
-    "@blockly/keyboard-navigation": "^3.0.1",
+    "@blockly/keyboard-navigation": "^4.0.0-beta.0",
     "@blockly/theme-modern": "^7.0.1",
     "@hyperjump/browser": "^1.1.4",
     "@hyperjump/json-schema": "^1.5.0",