[TASK] Drop support for EOL'ed Symfony versions

This is a pre-patch for adding support for Symfony 7.

Author: oliverklee

composer.json

@@ -21,10 +21,10 @@
         "php": "^7.2 || ^8.0",
         "ext-json": "*",
         "ext-zip": "*",
-        "symfony/console": "^4.4 || ^5.0 || ^6.0",
-        "symfony/dotenv": "^4.4 || ^5.0 || ^6.0",
-        "symfony/http-client": "^4.4 || ^5.0 || ^6.0",
-        "symfony/mime": "^4.4 || ^5.0 || ^6.0"
+        "symfony/console": "^4.4 || ^5.4 || ^6.4",
+        "symfony/dotenv": "^4.4 || ^5.4 || ^6.4",
+        "symfony/http-client": "^4.4 || ^5.4 || ^6.4",
+        "symfony/mime": "^4.4 || ^5.4 || ^6.4"
     },
     "require-dev": {
         "phpunit/phpunit": "^8.5.36",