Update dependency @vitejs/plugin-legacy to v6

package.json

@@ -33,7 +33,7 @@
   },
   "devDependencies": {
     "@rushstack/eslint-patch": "^1.1.0",
-    "@vitejs/plugin-legacy": "^2.0.0",
+    "@vitejs/plugin-legacy": "^6.0.0",
     "@vitejs/plugin-vue2": "^1.1.2",
     "@vue/eslint-config-prettier": "8.0.0",
     "eslint": "^8.5.0",