fix(deps): update dependency stylelint to v16.21.0 (#674)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -65,7 +65,7 @@
     "postcss-scss": "4.0.9",
     "postcss-styl": "0.12.3",
     "prettier": "3.5.3",
-    "stylelint": "16.20.0",
+    "stylelint": "16.21.0",
     "stylelint-order": "6.0.4",
     "stylelint-stylus": "1.0.0"
   }