Bump phpstan/phpstan from 1.11.2 to 2.1.6

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 1.11.2 to 2.1.6.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/2.1.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.11.2...2.1.6)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

composer.json

@@ -27,7 +27,7 @@
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.49",
-        "phpstan/phpstan": "^1.10",
+        "phpstan/phpstan": "^2.1",
         "phpunit/phpunit": "^10.4"
     },
     "autoload-dev": {