Update symfony to version 6

Author: frankdekker

composer.json

@@ -35,21 +35,21 @@
         "ext-iconv": "*",
         "czproject/git-php": "^4.0",
         "doctrine/annotations": "^1.13",
-        "symfony/config": "^5.4",
-        "symfony/console": "^5.4",
-        "symfony/dotenv": "^5.4",
-        "symfony/filesystem": "^5.4",
+        "symfony/config": "^6.0",
+        "symfony/console": "^6.0",
+        "symfony/dotenv": "^6.0",
+        "symfony/filesystem": "^6.0",
         "symfony/flex": "^v1.17.0",
-        "symfony/framework-bundle": "^5.4",
-        "symfony/http-client": "^5.4",
-        "symfony/mailer": "^5.4",
+        "symfony/framework-bundle": "^6.0",
+        "symfony/http-client": "^6.0",
+        "symfony/mailer": "^6.0",
         "symfony/monolog-bundle": "^3.7",
-        "symfony/process": "^5.4",
-        "symfony/property-access": "^5.4",
-        "symfony/runtime": "^5.4",
-        "symfony/serializer": "^5.4",
-        "symfony/twig-bundle": "^5.4",
-        "symfony/yaml": "^5.4",
+        "symfony/process": "^6.0",
+        "symfony/property-access": "^6.0",
+        "symfony/runtime": "^6.0",
+        "symfony/serializer": "^6.0",
+        "symfony/twig-bundle": "^6.0",
+        "symfony/yaml": "^6.0",
         "tijsverkoyen/css-to-inline-styles": "^2.2",
         "twig/twig": "^2.12|^3.0"
     },
@@ -60,6 +60,7 @@
         "mikey179/vfsstream": "^1.6",
         "php-parallel-lint/php-parallel-lint": "^1.3",
         "phpmd/phpmd": "^2.10",
+        "pdepend/pdepend": "dev-master as 2.10.2",
         "phpstan/extension-installer": "^1.1",
         "phpstan/phpstan": "0.12.*",
         "phpstan/phpstan-phpunit": "0.12.*",
@@ -68,7 +69,7 @@
         "roave/security-advisories": "dev-latest",
         "slevomat/coding-standard": "^7.0",
         "squizlabs/php_codesniffer": "^3.6",
-        "symfony/phpunit-bridge": "^5.4",
+        "symfony/phpunit-bridge": "^6.0",
         "symfony/polyfill-php80": "^1.23",
         "yep/reflection": "^2.1"
     },
@@ -110,7 +111,7 @@
     "extra": {
         "symfony": {
             "allow-contrib": true,
-            "require": "5.4.*"
+            "require": "6.0.*"
         }
     }
 }