Update dependency vitepress to v1.6.3

Author: renovate[bot]

package.json

@@ -92,7 +92,7 @@
     "typescript": "5.6.3",
     "typescript-eslint": "8.8.1",
     "vite": "5.4.8",
-    "vitepress": "1.4.0",
+    "vitepress": "1.6.3",
     "vitest": "2.1.2"
   },
   "peerDependencies": {