debug CI
Still debugging https://github.com/pandas-dev/pandas/pull/26816. Sorry for the noise.
I'm pretty confused by the test failures: https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=12996

```
______________________________ TestPDApi.test_api ______________________________
[gw1] darwin -- Python 3.5.6 /Users/vsts/miniconda3/envs/pandas-dev/bin/python

self = <pandas.tests.api.test_api.TestPDApi object at 0x13ed7a1d0>

    def test_api(self):
    
        self.check(pd,
                   self.lib + self.misc +
                   self.modules + self.deprecated_modules +
                   self.classes + self.deprecated_classes +
                   self.deprecated_classes_in_future +
                   self.funcs + self.funcs_option +
                   self.funcs_read + self.funcs_to +
                   self.deprecated_funcs_in_future +
                   self.deprecated_funcs + self.private_modules,
>                  self.ignored)

pandas/tests/api/test_api.py:113: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
pandas/tests/api/test_api.py:18: in check
    tm.assert_almost_equal(result, expected)
pandas/util/testing.py:325: in assert_almost_equal
    **kwargs)
pandas/_libs/testing.pyx:65: in pandas._libs.testing.assert_almost_equal
    cpdef assert_almost_equal(a, b,
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

>   raise_assert_detail(obj, '{0} length are different'.format(obj),
E   AssertionError: Iterable are different
E   
E   Iterable length are different
E   [left]:  132
E   [right]: 129
E   [diff]: ['missing_dependencies', 'dependency', 'hard_dependencies']
```

I don't see how these changes could have caused that, which makes me suspect a flaky test? I know at least one other contributor reported some issues with this test. Resolved by https://github.com/pandas-dev/pandas/pull/26953