Update dependency lerna to v8

Author: renovate[bot]

package.json

@@ -22,7 +22,7 @@
     "eslint": "8.57.0",
     "eslint-plugin-ghost": "3.4.0",
     "eslint-plugin-react": "7.37.2",
-    "lerna": "6.6.2",
+    "lerna": "8.1.9",
     "mocha": "11.0.1",
     "should": "13.2.3",
     "sinon": "19.0.2"