ci: Update dependency stylelint to v16.20.0

Author: renovate[bot]

package.json

@@ -73,7 +73,7 @@
     "jsdom": "26.1.0",
     "prettier": "3.5.3",
     "storybook": "8.6.14",
-    "stylelint": "16.19.1",
+    "stylelint": "16.20.0",
     "stylelint-config-recess-order": "6.0.0",
     "stylelint-config-standard": "38.0.0",
     "typescript": "5.8.3",