Bump stylelint from 15.5.0 to 15.6.0

Bumps [stylelint](https://github.com/stylelint/stylelint) from 15.5.0 to 15.6.0.
- [Release notes](https://github.com/stylelint/stylelint/releases)
- [Changelog](https://github.com/stylelint/stylelint/blob/main/CHANGELOG.md)
- [Commits](https://github.com/stylelint/stylelint/compare/15.5.0...15.6.0)

---
updated-dependencies:
- dependency-name: stylelint
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -23,7 +23,7 @@
         "postcss-import": "^15.1.0",
         "postcss-loader": "^7.2.4",
         "postcss-nesting": "^11.2.2",
-        "stylelint": "^15.4.0",
+        "stylelint": "^15.6.0",
         "stylelint-config-standard": "^33.0.0",
         "stylelint-webpack-plugin": "^4.1.1",
         "webpack": "^5.80.0",