Revert "NGSTACK-1000 upgrade bundle to use Ibexa 5"

This reverts commit 7f8032e.

Author: Ante Prkacin

composer.json

@@ -18,15 +18,15 @@
         }
     ],
     "require": {
-        "php": "^8.3",
-        "ibexa/core": "^5.0",
+        "php": "^8.1",
+        "ibexa/core": "^4.4",
         "twig/twig": "^3.0"
     },
     "require-dev": {
-        "ibexa/fieldtype-richtext": "^5.0",
-        "phpunit/phpunit": "^12.0",
-        "matthiasnoback/symfony-config-test": "^6.0",
-        "matthiasnoback/symfony-dependency-injection-test": "^6.0"
+        "ibexa/fieldtype-richtext": "^4.4",
+        "phpunit/phpunit": "^9.6",
+        "matthiasnoback/symfony-config-test": "^5.0",
+        "matthiasnoback/symfony-dependency-injection-test": "^5.0"
     },
     "minimum-stability": "dev",
     "prefer-stable": true,