Bump stylelint-config-standard from 25.0.0 to 29.0.0

Bumps [stylelint-config-standard](https://github.com/stylelint/stylelint-config-standard) from 25.0.0 to 29.0.0.
- [Release notes](https://github.com/stylelint/stylelint-config-standard/releases)
- [Changelog](https://github.com/stylelint/stylelint-config-standard/blob/main/CHANGELOG.md)
- [Commits](stylelint/stylelint-config-standard@25.0.0...29.0.0)

---
updated-dependencies:
- dependency-name: stylelint-config-standard
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -18,7 +18,7 @@
     "nightmare": "^3.0.2",
     "nyc": "^15.1.0",
     "stylelint": "^14.0.1",
-    "stylelint-config-standard": "^25.0.0",
+    "stylelint-config-standard": "^29.0.0",
     "stylelint-csstree-validator": "^2.0.0",
     "stylelint-scss": "^4.0.0"
   },