NumPy 2.0 support for IOs

[zm711]

We also need to start seeing which IOs are potentially not 2.0 ready. This is just a draft to start assessing this.

This is much better than I was expecting :)

FAILED neo/test/rawiotest/test_blackrockrawio.py::TestBlackrockRawIO::test_compare_blackrockio_with_matlabloader - KeyError: np.int64(-1)
FAILED neo/test/rawiotest/test_blackrockrawio.py::TestBlackrockRawIO::test_compare_blackrockio_with_matlabloader_v21 - OverflowError: Python integer -1 out of bounds for uint16
FAILED neo/test/rawiotest/test_blackrockrawio.py::TestBlackrockRawIO::test_read_all - KeyError: np.int64(-1)
FAILED neo/test/rawiotest/test_plexonrawio.py::TestPlexonRawIO::test_read_all - OverflowError: Python integer 4294967296 out of bounds for uint16

[zm711]

@samuelgarcia you can see the errors here for blackrock :)

[zm711]

I almost forgot about the med format. The Dark Horse Devs said they would help work on it when ready see issue here. Do we want to ping them for NumPy 2.0 or do we want to just have a branch to test if we want to fix it ourselves. I think they are doing some more major API changes. So maybe we actually want to have a separate install option for users? Not sure.