npm: bump grunt-stylelint from 0.20.0 to 0.20.1

Bumps [grunt-stylelint](https://github.com/wikimedia/grunt-stylelint) from 0.20.0 to 0.20.1.
- [Release notes](https://github.com/wikimedia/grunt-stylelint/releases)
- [Changelog](https://github.com/wikimedia/grunt-stylelint/blob/main/History.md)
- [Commits](https://github.com/wikimedia/grunt-stylelint/commits)

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

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

package.json

@@ -15,7 +15,7 @@
 		"grunt": "1.6.1",
 		"grunt-banana-checker": "0.13.0",
 		"grunt-eslint": "25.0.0",
-		"grunt-stylelint": "0.20.0",
+		"grunt-stylelint": "0.20.1",
 		"stylelint": "^16.6.1",
 		"stylelint-config-wikimedia": "latest",
 		"svgo": "3.3.2"