Platform-dependent test failures in `atanh` and `tanh`

[mdhaber]

In mdhaber/marray#176, I encountered the following test failures that appear to be inherited from array-api-strict. However, they are not encountered in array-api-strict CI because they all pass on Ubuntu. It appears that all fail on macOS, and the tanh ones fail on Windows.

array_api_tests/test_special_cases.py::test_unary[atanh(real(x_i) is +0 and imag(x_i) is NaN) -> +0 + NaN j] - AssertionError: out=(nan+nanj), but should be +0 + NaN j [atanh()]
array_api_tests/test_special_cases.py::test_unary[atanh(real(x_i) is 1 and imag(x_i) is +0) -> +infinity + 0j] - AssertionError: out=(inf+0.7853981633974483j), but should be +infinity + 0j [atanh()]
array_api_tests/test_special_cases.py::test_unary[atanh(real(x_i) is +infinity and imag(x_i) is NaN) -> +0 + NaN j] - AssertionError: out=(nan+1.5707963267948966j), but should be +0 + NaN j [atanh()]
array_api_tests/test_special_cases.py::test_unary[atanh(real(x_i) is NaN and imag(x_i) is +infinity) -> \xb10 + \u03c0j/2] - AssertionError: out=(nan+1.5707963267948966j), but should be ±0 + πj/2 [atanh()]
array_api_tests/test_special_cases.py::test_unary[tanh(real(x_i) is +0 and imag(x_i) is +infinity) -> +0 + NaN j] - AssertionError: out=(nan+nanj), but should be +0 + NaN j [tanh()]
array_api_tests/test_special_cases.py::test_unary[tanh(real(x_i) is +0 and imag(x_i) is NaN) -> +0 + NaN j] - AssertionError: out=(nan+nanj), but should be +0 + NaN j [tanh()]

Not sure if this requires any action, but it would be nice if they were added to the skip file.