chore(cli): bump commander@6

packages/vant-cli/package.json

@@ -63,7 +63,7 @@
     "chokidar": "^3.4.0",
     "clean-css": "^4.2.3",
     "codecov": "^3.7.0",
-    "commander": "^5.1.0",
+    "commander": "^6.0.0",
     "consola": "^2.12.2",
     "conventional-changelog": "^3.1.21",
     "cross-env": "^7.0.2",
@@ -97,8 +97,8 @@
     "vue-jest": "^5.0.0-alpha.6",
     "vue-loader": "^16.0.0-rc.2",
     "vue-router": "^4.0.0-rc.5",
-    "webpack": "^5.1.2",
-    "webpack-dev-server": "3.11.0",
+    "webpack": "^5.6.0",
+    "webpack-dev-server": "^3.11.0",
     "webpack-merge": "^5.0.0",
     "webpackbar": "^4.0.0"
   },