[Composer] Added missing ibexa/messenger package

Author: mnocon

composer.json

@@ -71,7 +71,8 @@
         "ibexa/tree-builder": "~4.6.x-dev",
         "ibexa/discounts": "~4.6.x-dev",
         "ibexa/discounts-codes": "~4.6.x-dev",
-        "ibexa/product-catalog-symbol-attribute": "~4.6.x-dev"
+        "ibexa/product-catalog-symbol-attribute": "~4.6.x-dev",
+        "ibexa/messenger": "~4.6.x-dev"
     },
     "scripts": {
         "fix-cs": "php-cs-fixer fix --config=.php-cs-fixer.php -v --show-progress=dots",