Bump @wordpress/eslint-plugin from 21.5.0 to 21.6.0

Bumps [@wordpress/eslint-plugin](https://github.com/WordPress/gutenberg/tree/HEAD/packages/eslint-plugin) from 21.5.0 to 21.6.0.
- [Release notes](https://github.com/WordPress/gutenberg/releases)
- [Changelog](https://github.com/WordPress/gutenberg/blob/trunk/packages/eslint-plugin/CHANGELOG.md)
- [Commits](https://github.com/WordPress/gutenberg/commits/@wordpress/eslint-plugin@21.6.0/packages/eslint-plugin)

---
updated-dependencies:
- dependency-name: "@wordpress/eslint-plugin"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package.json

@@ -66,7 +66,7 @@
 		"@wordpress/editor": "^14.11.0",
 		"@wordpress/element": "^6.13.0",
 		"@wordpress/env": "^10.13.0",
-		"@wordpress/eslint-plugin": "^21.5.0",
+		"@wordpress/eslint-plugin": "^21.6.0",
 		"@wordpress/hooks": "^4.13.0",
 		"@wordpress/i18n": "^5.13.0",
 		"@wordpress/icons": "^10.13.0",