Update stylelint-config-standard requirement from ^18.3.0 to ^19.0.0

Updates the requirements on [stylelint-config-standard](https://github.com/stylelint/stylelint-config-standard) to permit the latest version.
- [Release notes](https://github.com/stylelint/stylelint-config-standard/releases)
- [Changelog](https://github.com/stylelint/stylelint-config-standard/blob/master/CHANGELOG.md)
- [Commits](stylelint/stylelint-config-standard@18.3.0...19.0.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -52,7 +52,7 @@
     "posthtml-expressions": "^1.1.1",
     "posthtml-include": "^1.2.0",
     "posthtml-load-config": "^1.0.0",
-    "stylelint-config-standard": "^18.3.0",
+    "stylelint-config-standard": "^19.0.0",
     "tailwindcss": "^1.1.1"
   }
 }