chore(deps): support symfony 6.x

Author: bpanatta

composer.json

@@ -6,12 +6,12 @@
     "license": "BSD-3-Clause",
     "require": {
         "php": ">=7.1",
-        "symfony/form": "^2.8 || ^3.0 || ^4.0 || ^5.0",
-        "symfony/routing": "^2.8 || ^3.0 || ^4.0 || ^5.0",
-        "symfony/framework-bundle": "^2.8 || ^3.0 || ^4.0 || ^5.0",
-        "symfony/templating": "^3.2 || ^5.0",
+        "symfony/form": "^2.8 || ^3.0 || ^4.0 || ^5.0 || ^6.0",
+        "symfony/routing": "^2.8 || ^3.0 || ^4.0 || ^5.0 || ^6.0",
+        "symfony/framework-bundle": "^2.8 || ^3.0 || ^4.0 || ^5.0 || ^6.0",
+        "symfony/templating": "^3.2 || ^5.0 || ^6.0",
         "twig/twig": "^2.0 || ^3.0",
-        "symfony/security-core": "^2.8 || ^3.0 || ^4.0 || ^5.0"
+        "symfony/security-core": "^2.8 || ^3.0 || ^4.0 || ^5.0 || ^6.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^6.0 || ^7.0 || ^8.0",