enable ndarray.std tests on CPU

Author: Alexander-Makaryev

tests/skipped_tests.tbl

@@ -1357,10 +1357,6 @@ tests/third_party/cupy/statistics_tests/test_histogram.py::TestHistogram::test_h
 tests/third_party/cupy/statistics_tests/test_histogram.py::TestHistogram::test_histogram_weights_mismatch
 tests/third_party/cupy/statistics_tests/test_meanvar.py::TestMeanVar::test_mean_all
 tests/third_party/cupy/statistics_tests/test_meanvar.py::TestMeanVar::test_mean_axis
-tests/third_party/cupy/statistics_tests/test_meanvar.py::TestMeanVar::test_std_all
-tests/third_party/cupy/statistics_tests/test_meanvar.py::TestMeanVar::test_std_all_ddof
-tests/third_party/cupy/statistics_tests/test_meanvar.py::TestMeanVar::test_std_axis
-tests/third_party/cupy/statistics_tests/test_meanvar.py::TestMeanVar::test_std_axis_ddof
 tests/third_party/cupy/statistics_tests/test_meanvar.py::TestMeanVar::test_var_all
 tests/third_party/cupy/statistics_tests/test_meanvar.py::TestMeanVar::test_var_all_ddof
 tests/third_party/cupy/statistics_tests/test_meanvar.py::TestMeanVar::test_var_axis