Update dependency datetime to v4.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
datetime	==4.3 → ==4.9

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Release Notes

zopefoundation/DateTime (datetime)

v4.9

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v4.8

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• Fix insidious buildout configuration bug that prevented tests on Python 2.7
  and 3.5, and fix test code that was incompatible with Python 3.5.
  (#&#8203;44 <https://github.com/zopefoundation/DateTime/issues/44>_)

• Add support for Python 3.11.

v4.7

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• Fix rounding problem with DateTime addition beyond the year 2038
  (#&#8203;41 <https://github.com/zopefoundation/DateTime/issues/41>_)

v4.6

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• Fix __format__ method for DateTime objects
  (#&#8203;39 <https://github.com/zopefoundation/DateTime/issues/39>_)

v4.5

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• Add __format__ method for DateTime objects
  (#&#8203;35 <https://github.com/zopefoundation/DateTime/issues/35>_)

v4.4

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• Fix WAT definition
  #&#8203;31 <https://github.com/zopefoundation/DateTime/issues/31>_.

• Add support for Python 3.8, 3.9, and 3.10.

• Drop support for Python 3.4.

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