fix: for pooled memory used for reference types, clear it on return to the pool so that it doesn't prevent GC of the instances it contained (#6937)

src/Ryujinx.HLE/HOS/Kernel/SupervisorCall/Syscall.cs

@@ -616,7 +616,7 @@ namespace Ryujinx.HLE.HOS.Kernel.SupervisorCall
                 }
             }
 
-            ArrayPool<KSynchronizationObject>.Shared.Return(syncObjsArray);
+            ArrayPool<KSynchronizationObject>.Shared.Return(syncObjsArray, true);
 
             return result;
         }