composer(deps): update squizlabs/php_codesniffer requirement

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@3.9.0...3.9.1)

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

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

composer.json

@@ -36,7 +36,7 @@
     "friendsofphp/php-cs-fixer": "^v3.52.1",
     "sirbrillig/phpcs-variable-analysis": "^2.11.17",
     "slevomat/coding-standard": "^8.15.0",
-    "squizlabs/php_codesniffer": "^3.9.0"
+    "squizlabs/php_codesniffer": "^3.9.1"
   },
   "require-dev": {
     "phpstan/extension-installer": "^1.3.1",