Update composer.json

Drop support for symfony 4 and 5.

Author: nicoosh

composer.json

@@ -6,7 +6,7 @@
     "license": "MIT",
     "require": {
         "php": "^7.1|^8.0",
-        "symfony/framework-bundle": "^4.0|^5.0|^6.0|^7.0",
+        "symfony/framework-bundle": "^6.0|^7.0",
         "friendsofsymfony/elastica-bundle": "^6.0",
         "enqueue/enqueue-bundle": "^0.10"
     },