Update phpstan/phpstan requirement from ^1.11.2 to ^1.11.2 || ^2.0.0

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/2.0.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.11.2...2.0.1)

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

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

composer.json

@@ -56,7 +56,7 @@
         "ondrejmirtes/better-reflection": "^6.25.0.4",
         "phpmd/phpmd": "^2.15.0",
         "phpstan/extension-installer": "^1.3.1",
-        "phpstan/phpstan": "^1.11.2",
+        "phpstan/phpstan": "^1.11.2 || ^2.0.0",
         "phpunit/phpunit": "^10.5.20",
         "squizlabs/php_codesniffer": "^3.9.0"
     },