chore(deps): update dependency stylelint to v15 (#1350)

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

Author: renovate[bot]

packages/redux-devtools-ui/package.json

@@ -96,7 +96,7 @@
     "require-from-string": "^2.0.2",
     "rimraf": "^4.1.0",
     "styled-components": "^5.3.6",
-    "stylelint": "^14.16.1",
+    "stylelint": "^15.0.0",
     "stylelint-config-prettier": "^9.0.4",
     "stylelint-config-standard": "^29.0.0",
     "stylelint-config-styled-components": "^0.1.1",