Remove black version pin

[tmorrell]

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Description

The black version pin is causing the CI to unnecessarily fail https://github.com/inveniosoftware/idutils/actions/runs/7509942198/job/20447716064#step:7:75, and black isn't pinned on other RDM repositories https://github.com/inveniosoftware/invenio-rdm-records/blob/e268c43c8e948c9872c3616eb59b49d97f7c7a4a/setup.cfg#L61

Picking a newer specific black version is another alternative.

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[utnapischtim]

i would change to pytest-black-ng, because pytest-black is not more supported and it raises a deprecation warning about BlackItem here which is annoying. In the other packages i changed to pytest-black-ng>=0.4.0

[tmorrell]

Switched, thanks @utnapischtim