Update squizlabs/php_codesniffer requirement from ^3.11 to ^3.12

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@3.11.0...3.12.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -11,7 +11,7 @@
 		"php-mock/php-mock-phpunit": "^2.10",
 		"guzzlehttp/psr7": "^2.4",
 		"corpus/coding-standard": "^0.6.0",
-		"squizlabs/php_codesniffer": "^3.11",
+		"squizlabs/php_codesniffer": "^3.12",
 		"friendsofphp/php-cs-fixer": "^3.4",
 		"donatj/mddoc": "^0.10.1",
 		"donatj/drop": "^1.1",