Use PHPUnit 11 because it still supports test annotations

Author: neildaniels

composer.json

@@ -56,7 +56,7 @@
         "phpstan/phpstan": "^2.1.38",
         "phpstan/phpstan-deprecation-rules": "^2.0.3",
         "spaze/phpstan-disallowed-calls": "^4.7.0",
-        "phpunit/phpunit": "^9 || ^10 || ^11 || ^12",
+        "phpunit/phpunit": "^9 || ^10 || ^11",
         "php-http/guzzle7-adapter": "^1.0",
         "monolog/monolog": "^2.9.1 || ^3.0",
         "php-http/cache-plugin": "^1.7 || ^2.0",