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DOC: improve removal for julian dates [ci doc]
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‎doc/api/next_api_changes/removals/26852-OG.rst

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... of the `.dates` module are removed without replacements. These were
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undocumented and not exported.
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Julian dates in Matplotlib were calculated from a Julian date epoch: ``jdate =
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(date - np.datetime64(EPOCH)) / np.timedelta64(1, 'D')``. Conversely, a Julian
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date was converted to datetime as ``date = np.timedelta64(int(jdate * 24 *
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3600), 's') + np.datetime64(EPOCH)``. Matplotlib was using
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``EPOCH='-4713-11-24T12:00'`` so that 2000-01-01 at 12:00 is 2_451_545.0 (see
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<https://en.wikipedia.org/wiki/Julian_day>`).

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