chore(deps): update dependency stylelint to v15

Author: renovate[bot]

package.json

@@ -65,7 +65,7 @@
     "newt-client-js": "3.2.4",
     "prettier": "2.8.8",
     "sass": "1.62.1",
-    "stylelint": "13.13.1",
+    "stylelint": "15.7.0",
     "stylelint-a11y": "1.2.3",
     "stylelint-config-recess-order": "2.6.0",
     "stylelint-config-standard": "20.0.0",