refactor: revert 'allowUnsafeCode' back to 'false'

Author: 0xFA11

com.unity.multiplayer.mlapi/Runtime/com.unity.multiplayer.mlapi.runtime.asmdef

@@ -4,7 +4,7 @@
     "references": [],
     "includePlatforms": [],
     "excludePlatforms": [],
-    "allowUnsafeCode": true,
+    "allowUnsafeCode": false,
     "overrideReferences": false,
     "precompiledReferences": [],
     "autoReferenced": true,