Hyperbolic tests fail on Windows: ValueError: high is out of bounds for int32

[huonw]

Describe the bug

CI run on Windows: #1696 https://github.com/stellargraph/stellargraph/pull/1696/checks?check_run_id=793669259
Results: https://gistpreview.github.io/?f35d36d87f30d84d9c39a7e90512b240#3a757c57-c84c-4ba4-9262-33306656c50d

To Reproduce

Run tests on windows

Observed behavior

The following tests fail:

tests.utils.test_hyperbolic.test_poincare_ball_exp_specialisation
tests.utils.test_hyperbolic.test_poincare_ball_distance_self
tests.utils.test_hyperbolic.test_poincare_ball_distance_exp
tests.utils.test_hyperbolic.test_poincare_ball_distance_vs_euclidean

with an error like:

@pytest.fixture
    def seeded():
>       seed = np.random.randint(2 ** 32)

tests\utils\test_hyperbolic.py:25: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
mtrand.pyx:743: in numpy.random.mtrand.RandomState.randint
    ???
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

>   ???
E   ValueError: high is out of bounds for int32

_bounded_integers.pyx:1343: ValueError

Expected behavior

Testes should pass.

Environment

Operating system: Windows

Python: 3.6

StellarGraph develop: e9a6ea1

Additional context

N/A