Use alignment from `InteropMemoryHelper`

[Vixenka]

Instead of size variable use return AlignmentOf method from InteropMemoryHelper.

NoiseEngine/NoiseEngine/Interop/InteropArray.cs

Lines 63 to 67 in 98d8bfa

	public unsafe InteropArray(int length) {
	nuint size = (nuint)Marshal.SizeOf<T>();
	pointer = (T*)NativeMemory.AlignedAlloc(size * (nuint)length, size);
	Length = length;
	}