Update dependency postcss-less to v6

Author: renovate-bot

package-lock.json

@@ -53,7 +53,7 @@
     "eslint": "^8.6.0",
     "eslint-plugin-import": "^2.25.4",
     "eslint-plugin-jsonc": "^2.0.0",
-    "postcss-less": "^5.0.0",
+    "postcss-less": "^6.0.0",
     "stylelint": "^14.2.0",
     "stylelint-config-idiomatic-order": "^8.1.0",
     "stylelint-config-standard": "^24.0.0"