Update squizlabs/php_codesniffer requirement || ^4

Updates the requirements on [squizlabs/php_codesniffer](https://github.com/PHPCSStandards/PHP_CodeSniffer) to permit the latest version.

Updates `squizlabs/php_codesniffer` to 4.0.1
- [Release notes](https://github.com/PHPCSStandards/PHP_CodeSniffer/releases)
- [Changelog](https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/4.x/CHANGELOG-4.x.md)
- [Commits](PHPCSStandards/PHP_CodeSniffer@3.0.0...4.0.1)

---
updated-dependencies:
- dependency-name: squizlabs/php_codesniffer
  dependency-version: 4.0.1
  dependency-type: direct:development
  dependency-group: dev-dependencies
...

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

Author: dependabot[bot]

composer.json

@@ -39,7 +39,7 @@
         "phpunit/phpunit": "^10 || ^11",
         "rector/rector": "^2.0",
         "simplesamlphp/simplesamlphp-test-framework": "^1",
-        "squizlabs/php_codesniffer": "^3"
+        "squizlabs/php_codesniffer": "^3 || ^4"
     },
     "conflict": {
         "rector/rector": "2.3.0"