fix CUDA tests

Author: ytdHuang

test/ext-test/gpu/cuda_ext.jl

@@ -155,13 +155,6 @@ end
 end
 
 @testset "CUDA ptrace" begin
-    using Test
-    using QuantumToolbox
-    import StaticArraysCore: SVector
-
-    using CUDA
-    using CUDA.CUSPARSE
-
     g = fock(2, 1)
     e = fock(2, 0)
     α = sqrt(0.7)

test/runtests.jl

@@ -69,6 +69,8 @@ if (GROUP == "CUDA_Ext")
     Pkg.instantiate()
 
     using QuantumToolbox
+    import LinearAlgebra: Diagonal
+    import StaticArraysCore: SVector
     using CUDA
     using CUDA.CUSPARSE
     # CUDA.allowscalar(false) # This is already set in the extension script