symfony version update

Author: Fredrick Peter

composer.json

@@ -20,10 +20,10 @@
         "psr/log": "^1.0 || ^1.1.4",
         "vlucas/phpdotenv": "^5.3",
         "filp/whoops": "^2.15",
-        "symfony/var-dumper": "^5.4.3"
+        "symfony/var-dumper": "5.4.3"
     },
-    "override": {
-        "symfony/var-dumper": "*"
+    "conflict": {
+        "symfony/var-dumper": "^5.4.4 || ^6.0"
     },
     "autoload": {
         "files": [