chore(deps): update dependency vitepress to v1.6.4 (#811)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -32,7 +32,7 @@
     "search-insights": "2.17.3",
     "typescript": "5.9.2",
     "vite": "7.1.1",
-    "vitepress": "1.6.3",
+    "vitepress": "1.6.4",
     "vue-tsc": "3.0.5"
   }
 }