Update dependency python-dateutil to v2.9.0 (#69)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [python-dateutil](https://togithub.com/dateutil/dateutil) | `==2.8.2`
-> `==2.9.0` |
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|
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|
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---

### Release Notes

<details>
<summary>dateutil/dateutil (python-dateutil)</summary>

###
[`v2.9.0`](https://togithub.com/dateutil/dateutil/releases/tag/2.9.0)

[Compare
Source](https://togithub.com/dateutil/dateutil/compare/2.8.2...2.9.0)

### Version 2.9.0 (2024-02-29)

#### Data updates

- Updated tzdata version to 2024a. (gh pr
[#&#8203;1342](https://togithub.com/dateutil/dateutil/issues/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
[#&#8203;771](https://togithub.com/dateutil/dateutil/issues/771), gh pr
[#&#8203;1007](https://togithub.com/dateutil/dateutil/issues/1007))

#### Bugfixes

- Removed a call to `datetime.utcfromtimestamp`, which is deprecated as
of Python 3.12. Reported by Hugo van Kemenade (gh pr
[#&#8203;1284](https://togithub.com/dateutil/dateutil/issues/1284)),
fixed by Thomas Grainger (gh pr
[#&#8203;1285](https://togithub.com/dateutil/dateutil/issues/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
[@&#8203;hawkEye-01](https://togithub.com/hawkEye-01) (gh issue
[#&#8203;1167](https://togithub.com/dateutil/dateutil/issues/1167)).
Fixed by [@&#8203;Mifrill](https://togithub.com/Mifrill) (gh pr
[#&#8203;1168](https://togithub.com/dateutil/dateutil/issues/1168))

</details>

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requirements.txt

@@ -11,7 +11,7 @@ pycparser==2.21
 PyGithub==2.2.0
 PyJWT==2.8.0
 PyNaCl==1.5.0
-python-dateutil==2.8.2
+python-dateutil==2.9.0
 requests==2.31.0
 six==1.16.0
 smmap==5.0.1