Fixed compatibility issue

include/aidge/backend/cuda/utils/CudaContext.hpp

@@ -157,8 +157,10 @@ namespace Aidge {
             return CUDNN_DATA_UINT8;
         case DataType::Int32:
             return CUDNN_DATA_INT32;
+#if CUDNN_VERSION >= 8100
         case DataType::Int64:
             return CUDNN_DATA_INT64;
+#endif
         default:
             assert(false && "Unsupported CuDNN type");
         }