Update python-dateutil requirement from ~=2.6 to ~=2.9 in /requirements

[dependabot[bot]]

Updates the requirements on python-dateutil to permit the latest version.

Release notes

Sourced from python-dateutil's releases.

2.9.0.post0

Version 2.9.0.post0 (2024-03-01)

Bugfixes

• Pinned setuptools_scm to <8, which should make the generated _version.py file compatible with all supported versions of Python.

Changelog

Sourced from python-dateutil's changelog.

Version 2.9.0.post0 (2024-03-01)

Bugfixes

• Pinned setuptools_scm to <8, which should make the generated _version.py file compatible with all supported versions of Python.

Version 2.9.0 (2024-02-29)

Data updates

• Updated tzdata version to 2024a. (gh pr #1342)

Features

• Made all dateutil submodules lazily imported using PEP 562 <https://www.python.org/dev/peps/pep-0562/>_. On Python 3.7+, things like import dateutil; dateutil.tz.gettz("America/New_York") will now work without explicitly importing dateutil.tz, with the import occurring behind the scenes on first use. The old behavior remains on Python 3.6 and earlier. Fixed by Orson Adams. (gh issue #771, gh pr #1007)

Bugfixes

• Removed a call to datetime.utcfromtimestamp, which is deprecated as of Python 3.12. Reported by Hugo van Kemenade (gh pr #1284), fixed by Thomas Grainger (gh pr #1285).

Documentation changes

• Added note into docs and tests where relativedelta would return last day of the month only if the same day on a different month resolves to a date that doesn't exist. Reported by @​hawkEye-01 (gh issue #1167). Fixed by @​Mifrill (gh pr #1168)

Version 2.8.2 (2021-07-08)

Data updates

• Updated tzdata version to 2021a. (gh pr #1128)

... (truncated)

Commits

• 1ae8077 Merge pull request #1346 from pganssle/release_2.9.0.post0
• ee6de9d Update news to prepare for release
• 9780d32 Pin setuptools_scm to <8
• db9d018 Merge pull request #1343 from pganssle/release_2.9.0
• 423ca2f Run updatezinfo before build
• edd3fd4 Update NEWS file
• fe02d02 Run towncrier with Python 3.11
• 9c7524a Fix MANIFEST.in pattern
• 6de58f5 Update classifiers to include Python 3.12
• 8fe0cab Merge pull request #1342 from pganssle/update_zoneinfo
• Additional commits viewable in compare view

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[JarbasAl]

@dependabot rebase