chore(deps): update dependency @rcdoc/theme to v0.1.12

Author: renovate[bot]

packages/react-vant/package.json

@@ -94,7 +94,7 @@
   },
   "devDependencies": {
     "@rcdoc/cli": "0.1.29",
-    "@rcdoc/theme": "0.1.8",
+    "@rcdoc/theme": "0.1.12",
     "@types/node": "17.0.45",
     "@types/react": "18.0.17",
     "@types/react-dom": "18.0.7",