update phpunit

Author: wing328

modules/openapi-generator/src/main/resources/php-laravel/composer.mustache

@@ -29,7 +29,7 @@
         "crell/serde": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5"
+        "phpunit/phpunit": "^12.0"
     },
     "autoload": {
         "psr-4": {

samples/server/petstore/php-laravel-issue-21334/composer.json

@@ -21,7 +21,7 @@
         "crell/serde": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5"
+        "phpunit/phpunit": "^12.0"
     },
     "autoload": {
         "psr-4": {

samples/server/petstore/php-laravel/composer.json

@@ -21,7 +21,7 @@
         "crell/serde": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5"
+        "phpunit/phpunit": "^12.0"
     },
     "autoload": {
         "psr-4": {