fix(deps): update dependency vitepress to v1.0.0-alpha.73

Author: renovate[bot]

package.json

@@ -33,7 +33,7 @@
     "segment": "^0.1.3",
     "shiki": "0.14.1",
     "vite": "4.2.1",
-    "vitepress": "1.0.0-alpha.69",
+    "vitepress": "1.0.0-alpha.73",
     "vue": "3.2.47"
   },
   "pnpm": {