Update dependency DateTime to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
DateTime	~=4.3 → ~=6.0

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Release Notes

zopefoundation/DateTime (DateTime)

v6.0

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• Add support for Python 3.13, 3.14.

• Drop support for Python 3.7, 3.8, 3.9.

• Remove setuptools fossils.

• Remove Python2 compatiblity code.

v5.5

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• Change pickle format to export the microseconds as an int, to
  solve a problem with dates after 2038.
  (#&#8203;56 <https://github.com/zopefoundation/DateTime/issues/56>_)

v5.4

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• Fix UnknownTimeZoneError when unpickling DateTime.DateTime().asdatetime().
  (#&#8203;58 <https://github.com/zopefoundation/DateTime/issues/58>_)

• Repair equality comparison between DateTime instances and other types.
  (#&#8203;60 <https://github.com/zopefoundation/DateTime/issues/60>_)

v5.3

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• Add support for Python 3.12.

• Add preliminary support for Python 3.13a2.

v5.2

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• Cast int to float in compare methods.
• Fix compare methods between DateTime instances and None.
  (#&#8203;52 <https://github.com/zopefoundation/DateTime/issues/52>_)

v5.1

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• Add missing python_requires to setup.py.

v5.0

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• Drop support for Python 2.7, 3.5, 3.6.

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