CI: Failing np.bool on numpy master
```
=================================== FAILURES ===================================

_________________________ test_dataframe_div_silenced __________________________

[gw0] linux -- Python 3.9.0 /home/travis/virtualenv/python3.9-dev/bin/python

    def test_dataframe_div_silenced():

        # GH#26793

        pdf1 = pd.DataFrame(

            {

                "A": np.arange(10),

                "B": [np.nan, 1, 2, 3, 4] * 2,

                "C": [np.nan] * 10,

                "D": np.arange(10),

            },

            index=list("abcdefghij"),

            columns=list("ABCD"),

        )

        pdf2 = pd.DataFrame(

            np.random.randn(10, 4), index=list("abcdefghjk"), columns=list("ABCX")

        )

        with tm.assert_produces_warning(None):

>           pdf1.div(pdf2, fill_value=0)

pandas/tests/arithmetic/test_numeric.py:1311: 

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <contextlib._GeneratorContextManager object at 0x7f00d965da90>

type = None, value = None, traceback = None

    def __exit__(self, type, value, traceback):

        if type is None:

            try:

>               next(self.gen)

E               AssertionError: Caused unexpected warning(s): [('DeprecationWarning', DeprecationWarning('`np.bool` is a deprecated alias for the builtin `bool`. Use `bool` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.bool_` here.'), '/home/travis/build/pandas-dev/pandas/pandas/core/indexes/base.py', 377), ('DeprecationWarning', DeprecationWarning('`np.bool` is a deprecated alias for the builtin `bool`. Use `bool` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.bool_` here.'), '/home/travis/build/pandas-dev/pandas/pandas/core/indexes/base.py', 377), ('DeprecationWarning', DeprecationWarning('`np.bool` is a deprecated alias for the builtin `bool`. Use `bool` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.bool_` here.'), '/home/travis/build/pandas-dev/pandas/pandas/core/indexes/base.py', 377), ('DeprecationWarning', DeprecationWarning('`np.bool` is a deprecated alias for the builtin `bool`. Use `bool` by itself, which is identical in behavior, to silence this warning. If you specifically wanted the numpy scalar type, use `np.bool_` here.'), '/home/travis/build/pandas-dev/pandas/pandas/core/indexes/base.py', 377)]
```

https://travis-ci.org/github/pandas-dev/pandas/jobs/699262221