Bump stylelint from 13.6.1 to 13.7.0

Bumps [stylelint](https://github.com/stylelint/stylelint) from 13.6.1 to 13.7.0.
- [Release notes](https://github.com/stylelint/stylelint/releases)
- [Changelog](https://github.com/stylelint/stylelint/blob/master/CHANGELOG.md)
- [Commits](stylelint/stylelint@13.6.1...13.7.0)

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

Author: dependabot[bot]

package.json

@@ -26,7 +26,7 @@
     "grunt-stylelint": "0.15.0",
     "load-grunt-tasks": "5.1.0",
     "sass": "1.26.10",
-    "stylelint": "13.6.1",
+    "stylelint": "13.7.0",
     "stylelint-order": "4.1.0",
     "stylelint-scss": "3.18.0"
   },