Update squizlabs/php_codesniffer requirement from ^3.13 to ^4.0

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/4.x/CHANGELOG-4.x.md)
- [Commits](PHPCSStandards/PHP_CodeSniffer@3.13.0...4.0.1)

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

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

Author: dependabot[bot]

composer.json

@@ -41,7 +41,7 @@
     "php-http/psr7-integration-tests": "^1.5",
     "phpstan/phpstan": "^2.1",
     "phpunit/phpunit": "^9.6 || ^10",
-    "squizlabs/php_codesniffer": "^3.13"
+    "squizlabs/php_codesniffer": "^4.0"
   },
   "provide": {
     "psr/http-message-implementation": "^1.0 || ^2.0",