Add conflict for symfony/framework-bundle versions that break enum serializing (#6292)

Co-authored-by: Gwendolen Lynch <[email protected]>

Author: soyuka

composer.json

@@ -97,7 +97,8 @@
         "doctrine/orm": "<2.14.0",
         "doctrine/mongodb-odm": "<2.4",
         "doctrine/persistence": "<1.3",
-        "symfony/var-exporter" : "<6.1.1",
+        "symfony/framework-bundle": "6.4.6 || 7.0.6",
+        "symfony/var-exporter": "<6.1.1",
         "phpunit/phpunit": "<9.5",
         "phpspec/prophecy": "<1.15",
         "elasticsearch/elasticsearch": ">=8.0"