Cleanup

PerfectNumbers.Core/DivisorCycleCache.cs

@@ -1,10 +1,5 @@
-using System.Buffers;
-using System.Collections.Concurrent;
-using System.Collections.Generic;
 using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
 using ILGPU;
-using ILGPU.Algorithms;
 using ILGPU.Runtime;
 using PerfectNumbers.Core.Gpu;
 using PerfectNumbers.Core.Gpu.Accelerators;