unskip nansum tests on GPU

Author: Alexander-Makaryev

tests/skipped_tests_gpu.tbl

@@ -189,7 +189,6 @@ tests/third_party/cupy/sorting_tests/test_sort.py::TestPartition_param_3_{extern
 tests/third_party/cupy/sorting_tests/test_sort.py::TestPartition_param_3_{external=True, length=20000}::test_partition_sequence_kth
 
 tests/third_party/intel/test_zero_copy_test1.py::test_dpnp_interaction_with_dpctl_memory
-tests/test_arithmetic.py::TestArithmetic::test_nansum
 tests/test_arraymanipulation.py::TestHstack::test_generator
 tests/test_arraymanipulation.py::TestVstack::test_generator
 tests/test_dparray.py::test_astype[[-2, -1, 0, 1, 2]-float64-float64]