PHP >= 7.4 is fine and update PHPStan to ~2.1

Author: borkweb

composer.json

@@ -20,12 +20,12 @@
         "source": "https://github.com/WordPress/php-ai-client"
     },
     "require": {
-        "php": ">=7.4 || ^8.0",
+        "php": ">=7.4",
         "ext-json": "*"
     },
     "require-dev": {
         "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
-        "phpstan/phpstan": "^1.10",
+        "phpstan/phpstan": "~2.1",
         "phpunit/phpunit": "^9.5 || ^10.0",
         "squizlabs/php_codesniffer": "^3.7"
     },