deps: update dependency pytest to v8 (#357)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pytest](https://docs.pytest.org/en/latest/)
([source](https://togithub.com/pytest-dev/pytest),
[changelog](https://docs.pytest.org/en/stable/changelog.html)) |
`>=7.4,<7.5` -> `>=8,<8.1` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/pytest/8.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/pytest/8.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/pytest/7.4.4/8.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/pytest/7.4.4/8.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v8.0.0`](https://togithub.com/pytest-dev/pytest/compare/7.4.4...8.0.0)

[Compare
Source](https://togithub.com/pytest-dev/pytest/compare/7.4.4...8.0.0)

</details>

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setup.py

@@ -53,7 +53,7 @@
         "test": [
             "coverage>=7.4,<7.5",
             "pylint>=3,<3.1",
-            "pytest>=7.4,<7.5",
+            "pytest>=8,<8.1",
             "pytest-cov>=4.1.0,<4.2",
             "mypy>=1.8,<1.9",
             "types-python-dateutil",