style: update theme version

Author: ruanyf

package.json

@@ -23,6 +23,6 @@
   "dependencies": {
     "gh-pages": "6.x",
     "loppo": "^0.6.24",
-    "loppo-theme-wangdoc": "^0.7.1"
+    "loppo-theme-wangdoc": "^0.7.3"
   }
 }