Dispose GPU resources safely

PerfectNumbers.Core/Gpu/MersenneNumberResidueGpuTester.cs

@@ -78,10 +78,9 @@ public class MersenneNumberResidueGpuTester(bool useGpuOrder)
         finally
         {
                 ArrayPool<ulong>.Shared.Return(orderArray);
-                }
-
                 orderBuffer.Dispose();
                 gpuLease.Dispose();
+        }
 
     }
 }