chore(deps): update dependency less to ^4.6.4

Author: renovate[bot]

packages/vant-cli/package.json

@@ -54,7 +54,7 @@
     "hash-sum": "^2.0.0",
     "highlight.js": "^11.11.1",
     "husky": "^9.1.7",
-    "less": "^4.5.1",
+    "less": "^4.6.4",
     "lodash": "^4.17.23",
     "markdown-it": "^14.1.0",
     "markdown-it-anchor": "^9.2.0",