deps(deps-dev): update friendsofphp/php-cs-fixer requirement

Updates the requirements on [friendsofphp/php-cs-fixer](https://github.com/PHP-CS-Fixer/PHP-CS-Fixer) to permit the latest version.
- [Release notes](https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/releases)
- [Changelog](https://github.com/PHP-CS-Fixer/PHP-CS-Fixer/blob/master/CHANGELOG.md)
- [Commits](PHP-CS-Fixer/PHP-CS-Fixer@v3.90.0...v3.91.2)

---
updated-dependencies:
- dependency-name: friendsofphp/php-cs-fixer
  dependency-version: 3.91.2
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -34,7 +34,7 @@
         "webmozart/assert": "^1.9"
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^3.90",
+        "friendsofphp/php-cs-fixer": "^3.91",
         "mikey179/vfsstream": "^1.6",
         "phpspec/prophecy": "^1.10",
         "phpspec/prophecy-phpunit": "^2.4",