Update wp-coding-standards/wpcs requirement from ^2.3 to ^2.3 || ^3.0

Updates the requirements on [wp-coding-standards/wpcs](https://github.com/WordPress/WordPress-Coding-Standards) to permit the latest version.
- [Release notes](https://github.com/WordPress/WordPress-Coding-Standards/releases)
- [Changelog](https://github.com/WordPress/WordPress-Coding-Standards/blob/develop/CHANGELOG.md)
- [Commits](WordPress/WordPress-Coding-Standards@2.3.0...3.0.0)

---
updated-dependencies:
- dependency-name: wp-coding-standards/wpcs
  dependency-type: direct:development
...

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

composer.json

@@ -22,7 +22,7 @@
     "roave/security-advisories": "dev-master",
     "sirbrillig/phpcs-variable-analysis": "^2.11.2",
     "squizlabs/php_codesniffer": "^3",
-    "wp-coding-standards/wpcs": "^2.3",
+    "wp-coding-standards/wpcs": "^2.3 || ^3.0",
     "yoast/phpunit-polyfills": "^0.2.0 || ^1.0.0"
   },
   "suggest": {