[php-symfony] Symfony6 support (#11810)

* support symfony6

* fix issues with StrictJsonDeserialization

* regenerate samples

* add suggestions

* update samples

* support php 7.4 and symfony 5

* allow versions based on semantic versioning

* regenerate sample

* change method of determining result types

* update samples

* describe usage of bundle in symfony app

* better documentation

* fix duplicate auth methods

* do not set namespace for default types

* fix UploadedFile type

* next try fixing auth

* regenerate samples

* fix: auth method shall not be duplicated

* Revert "fix duplicate auth methods"

This reverts commit 0dc418737b.

* chore: regenerate samples

* fix tests

* regenerate sample

* more fixes for tests

* update tests

* add kernel shutdown

Co-authored-by: Benjamin Haeublein <benjaminh@testing-vm.lan.benjaminh.de>
Co-authored-by: Renaud de Chivré <renaud@tahitiwebdesign.com>

samples/server/petstore/php-symfony/SymfonyBundle-php/README.md

@@ -8,7 +8,7 @@ This [Symfony](https://symfony.com/) bundle is automatically generated by the [O
 
 ## Requirements
 
-PHP 7.1.3 and later
+PHP 8.0 and later
 
 ## Installation & Usage
 
@@ -45,26 +45,20 @@ composer install
 
 Step 1: Please follow the [installation procedure](#installation--usage) first.
 
-Step 2: Enable the bundle in the kernel:
+Step 2: Enable the bundle in the bundle configuration:
 
 ```php
-<?php
-// app/AppKernel.php
-
-public function registerBundles()
-{
-    $bundles = array(
-        // ...
-        new OpenAPI\Server\OpenAPIServerBundle(),
-        // ...
-    );
-}
+// app/config/bundles.php
+return [
+    // ...
+    OpenAPI\Server\OpenAPIServerBundle::class => ['all' => true],
+];
 ```
 
 Step 3: Register the routes:
 
 ```yaml
-# app/config/routing.yml
+# app/config/routes.yaml
 open_api_server:
     resource: "@OpenAPIServerBundle/Resources/config/routing.yml"
 ```
@@ -93,7 +87,7 @@ class PetApi implements PetApiInterface // An interface is autogenerated
     /**
      * Implementation of PetApiInterface#addPet
      */
-    public function addPet(Pet $pet)
+    public function addPet(Pet $pet, &$responseCode, array &$responseHeaders): array|\OpenAPI\Server\Model\Pet
     {
         // Implement the operation ...
     }
@@ -105,11 +99,10 @@ class PetApi implements PetApiInterface // An interface is autogenerated
 Step 5: Tag your API implementation:
 
 ```yaml
-# src/Acme/MyBundle/Resources/services.yml
+# config/services.yml
 services:
     # ...
-    acme.my_bundle.api.pet:
-        class: Acme\MyBundle\Api\PetApi
+    Acme\MyBundle\Api\PetApi:
         tags:
             - { name: "open_api_server.api", api: "pet" }
     # ...