Update whatsNewUrl (#54196)

package.json

@@ -58,7 +58,7 @@
     "betterer:stats": "ts-node --transpile-only --project ./scripts/cli/tsconfig.json ./scripts/cli/reportBettererStats.ts"
   },
   "grafana": {
-    "whatsNewUrl": "https://grafana.com/docs/grafana/next/whatsnew/whats-new-in-v8-5/",
+    "whatsNewUrl": "https://grafana.com/docs/grafana/next/whatsnew/whats-new-in-v9-0/",
     "releaseNotesUrl": "https://grafana.com/docs/grafana/next/release-notes/"
   },
   "lint-staged": {