chore(deps): update dependency lerna to v9

Author: renovate[bot]

backstage/package.json

@@ -30,7 +30,7 @@
   "devDependencies": {
     "@backstage/cli": "^0.34.0",
     "concurrently": "^9.1.2",
-    "lerna": "^8.2.1",
+    "lerna": "^9.0.0",
     "node-gyp": "^11.1.0",
     "prettier": "^3.5.3",
     "typescript": "^5.8.2"