chore(deps): update dependency vitepress to v1.0.0-alpha.9 (#1290)

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

Author: renovate[bot]

package.json

@@ -134,7 +134,7 @@
     "typescript": "~4.7.4",
     "validator": "~13.7.0",
     "vite": "~3.0.9",
-    "vitepress": "1.0.0-alpha.8",
+    "vitepress": "1.0.0-alpha.9",
     "vitest": "~0.22.1"
   },
   "packageManager": "pnpm@7.9.3",