Update phpstan/phpstan requirement from ^1.11.8 to ^1.11.11 (#261)

Updates the requirements on [phpstan/phpstan](https://github.com/phpstan/phpstan) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/1.12.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.11.8...1.11.11)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -16,7 +16,7 @@
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.61",
         "phpunit/phpunit": "^10.5.26",
-        "phpstan/phpstan": "^1.11.8",
+        "phpstan/phpstan": "^1.11.11",
         "rector/rector": "^1.2",
         "vimeo/psalm": "^5.25"
     },