feat: drop symfony 4 support (#27)

Author: geerteltink

composer.json

@@ -16,7 +16,7 @@
   "require": {
     "php": "^7.4 || ^8.0",
     "psr/container": "^1.0 || ^2.0",
-    "symfony/console": "^4.0 || ^5.0 || ^6.0"
+    "symfony/console": "^5.0 || ^6.0"
   },
   "require-dev": {
     "laminas/laminas-coding-standard": "^2.3.0",