Bump stylelint-config-standard from 26.0.0 to 29.0.0

Bumps [stylelint-config-standard](https://github.com/stylelint/stylelint-config-standard) from 26.0.0 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@26.0.0...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] <[email protected]>

Author: dependabot[bot]

package.json

@@ -47,7 +47,7 @@
     "posthtml-include": "1.7.4",
     "posthtml-load-config": "2.0.0",
     "stylelint": "14.9.1",
-    "stylelint-config-standard": "26.0.0",
+    "stylelint-config-standard": "29.0.0",
     "tailwindcss": "2.1.4"
   }
 }