Update phpstan/phpstan requirement from ^1.1 to ^1.1 || ^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/2.1.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.1.0...2.1.8)

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

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

Author: dependabot[bot]

composer.json

@@ -39,7 +39,7 @@
     "require-dev": {
         "brainmaestro/composer-git-hooks": "^2.8",
         "friendsofphp/php-cs-fixer": "^3.2",
-        "phpstan/phpstan": "^1.1",
+        "phpstan/phpstan": "^1.1 || ^2.0",
         "phpunit/phpunit": "^9.0 || ^8.0",
         "swoole/ide-helper": "~4.4.0",
         "symfony/var-dumper": "^5.3"