add missing using

Author: mohnjiles

StabilityMatrix.Core/Models/Packages/KohyaSs.cs

@@ -3,6 +3,7 @@
 using StabilityMatrix.Core.Helper;
 using StabilityMatrix.Core.Helper.Cache;
 using StabilityMatrix.Core.Helper.HardwareInfo;
+using StabilityMatrix.Core.Models.FileInterfaces;
 using StabilityMatrix.Core.Models.Progress;
 using StabilityMatrix.Core.Processes;
 using StabilityMatrix.Core.Python;