Update ext/LinearSolveCUSOLVERRFExt.jl

Author: ChrisRackauckas

ext/LinearSolveCUSOLVERRFExt.jl

@@ -68,7 +68,7 @@ function SciMLBase.solve!(cache::LinearSolve.LinearCache, alg::LinearSolve.CUSOL
     u_gpu = cache.u isa CUDA.CuArray ? cache.u : CUDA.CuArray(cache.u)
 
     # Solve
-    copy!(u_gpu, b_gpu)
+    copyto!(u_gpu, b_gpu)
     ldiv!(F, u_gpu)
 
     # Copy back to CPU if needed