Update dependency @vuepress/client to v2.0.0-beta.66

Author: renovate[bot]

package.json

@@ -9,7 +9,7 @@
     "docs:dev": "vuepress dev docs"
   },
   "devDependencies": {
-    "@vuepress/client": "2.0.0-beta.51",
+    "@vuepress/client": "2.0.0-beta.66",
     "vue": "3.2.40",
     "vuepress": "2.0.0-beta.51",
     "vuepress-theme-hope": "2.0.0-beta.109"