Update phpstan/phpstan requirement from ^1.11 to ^1.11 || ^2.0

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@1.11.0...2.0.1)

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

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

Author: dependabot[bot]

composer.json

@@ -23,7 +23,7 @@
     "guzzlehttp/psr7": "^2.0"
   },
   "require-dev": {
-    "phpstan/phpstan": "^1.11",
+    "phpstan/phpstan": "^1.11 || ^2.0",
     "phpunit/phpunit": "^10.5",
     "guzzlehttp/guzzle": "^7.8",
     "friendsofphp/php-cs-fixer": "^3.57",