Update dependency vuepress to v1.9.10

Author: renovate[bot]

Diff for: package.json

@@ -4,6 +4,6 @@
     "docs:build": "vuepress build docs"
   },
   "devDependencies": {
-    "vuepress": "1.7.1"
+    "vuepress": "1.9.10"
   }
 }