Remove PHP requirement, require Sylius at ^1.11

Author: stefandoorn

composer.json

@@ -8,8 +8,7 @@
         "sylius-plugin"
     ],
     "require": {
-        "php": "^7.4 || ^8.0",
-        "sylius/sylius": "~1.9.0 || ~1.10.0 || ~1.11.0",
+        "sylius/sylius": "^1.11",
         "xynnn/google-tag-manager-bundle": "^3.0"
     },
     "require-dev": {
@@ -56,11 +55,6 @@
             "phpstan/extension-installer": false
         }
     },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "1.9-dev"
-        }
-    },
     "autoload": {
         "psr-4": {
             "GtmPlugin\\": "src/"