Update dependency pytest to v8 (#52)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [pytest](https://docs.pytest.org/en/latest/) ([source](https://github.com/pytest-dev/pytest), [changelog](https://docs.pytest.org/en/stable/changelog.html)) | dev | major | `7.4.4` -> `8.0.0` |

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### Release Notes

<details>
<summary>pytest-dev/pytest (pytest)</summary>

### [`v8.0.0`](https://github.com/pytest-dev/pytest/releases/tag/8.0.0): pytest 8.0.0 (2024-01-27)

[Compare Source](pytest-dev/pytest@7.4.4...8.0.0)

See [8.0.0rc1](https://github.com/pytest-dev/pytest/releases/tag/8.0.0rc1) and [8.0.0rc2](https://github.com/pytest-dev/pytest/releases/tag/8.0.0rc2) for the full changes since pytest 7.4!

#### Bug Fixes

-   [#&#8203;11842](pytest-dev/pytest#11842): Properly escape the `reason` of a `skip <pytest.mark.skip ref>`{.interpreted-text role="ref"} mark when writing JUnit XML files.
-   [#&#8203;11861](pytest-dev/pytest#11861): Avoid microsecond exceeds `1_000_000` when using `log-date-format` with `%f` specifier, which might cause the test suite to crash.

</details>

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Reviewed-on: https://git.apud.pl/jacek/adventofcode/pulls/52
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