Update squizlabs/php_codesniffer requirement from ^3.8 to ^3.9

Updates the requirements on [squizlabs/php_codesniffer](https://github.com/PHPCSStandards/PHP_CodeSniffer) to permit the latest version.
- [Release notes](https://github.com/PHPCSStandards/PHP_CodeSniffer/releases)
- [Changelog](https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/CHANGELOG.md)
- [Commits](PHPCSStandards/PHP_CodeSniffer@3.8.0...3.9.0)

---
updated-dependencies:
- dependency-name: squizlabs/php_codesniffer
  dependency-type: direct:development
...

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

composer.json

@@ -33,7 +33,7 @@
         "phpstan/phpstan-phpunit": "^1.3",
         "phpunit/phpunit": "^10.5",
         "spatie/ignition": "^1.12",
-        "squizlabs/php_codesniffer": "^3.8",
+        "squizlabs/php_codesniffer": "^3.9",
         "symfony/var-dumper": "^7.0",
         "vimeo/psalm": "^5.22"
     },