Update dependency lerna to v8

Author: renovate[bot]

package.json

@@ -23,6 +23,6 @@
   "devDependencies": {
     "eslint": "8.39.0",
     "eslint-plugin-ghost": "2.16.0",
-    "lerna": "7.2.0"
+    "lerna": "8.1.2"
   }
 }