Update squizlabs/php_codesniffer requirement from ~3.8.0 to ~3.9.2

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...3.9.2)

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

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

composer.json

@@ -19,6 +19,6 @@
   },
   "require-dev": {
     "phpunit/phpunit": "~9.6.0",
-    "squizlabs/php_codesniffer": "~3.8.0"
+    "squizlabs/php_codesniffer": "~3.9.2"
   }
 }