[php-symfony] add compatibility with Symfony 8 (#25111)

From my tests (with Symfony 8.1), this is all that is needed.

(FWIW: I tested with this OpenApi file
 https://codeberg.org/gturri/todoList/src/branch/main/openapi.yaml
 and everything worked well with only this local change)

This fixes #25107

Author: gturri

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

@@ -29,15 +29,15 @@
         "ext-json": "*",
         "ext-mbstring": "*",
         "doctrine/annotations": "^2.0",
-        "symfony/validator": "^6.4|^7.0",
+        "symfony/validator": "^6.4|^7.0|^8.0",
         "jms/serializer-bundle": "^5.4",
-        "symfony/framework-bundle": "^6.4|^7.0"
+        "symfony/framework-bundle": "^6.4|^7.0|^8.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^10.5|^11.0",
         "friendsofphp/php-cs-fixer": "*",
-        "symfony/browser-kit": "^6.4|7.0",
-        "symfony/yaml": "^6.4|^7.0",
+        "symfony/browser-kit": "^6.4|7.0|^8.0",
+        "symfony/yaml": "^6.4|^7.0|^8.0",
         "hoa/regex": "~1.0"
     },
     "autoload": {

samples/server/petstore/php-symfony/SymfonyBundle-php/composer.json

@@ -21,15 +21,15 @@
         "ext-json": "*",
         "ext-mbstring": "*",
         "doctrine/annotations": "^2.0",
-        "symfony/validator": "^6.4|^7.0",
+        "symfony/validator": "^6.4|^7.0|^8.0",
         "jms/serializer-bundle": "^5.4",
-        "symfony/framework-bundle": "^6.4|^7.0"
+        "symfony/framework-bundle": "^6.4|^7.0|^8.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^10.5|^11.0",
         "friendsofphp/php-cs-fixer": "*",
-        "symfony/browser-kit": "^6.4|7.0",
-        "symfony/yaml": "^6.4|^7.0",
+        "symfony/browser-kit": "^6.4|7.0|^8.0",
+        "symfony/yaml": "^6.4|^7.0|^8.0",
         "hoa/regex": "~1.0"
     },
     "autoload": {