Flaky test for `test_max_relative_upstroke_velocity_no_sigmoid`

[finsberg]

This test is as follows

def test_max_relative_upstroke_velocity_no_sigmoid(calcium_trace):
    x, y = calcium_trace
    max_up = apf.features.max_relative_upstroke_velocity(x, y, sigmoid_fit=False)
    assert np.isclose(max_up.value, 0.03773708905899542)
    assert np.isclose(max_up.index, 16)

However, recently this test fails on Ubuntu in CI. I am not able to reproduce this locally

[finsberg]

Deactivate test in #50