Update pytest requirement from <8.0.0,>=4.6 to >=4.6,<9.0.0

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@4.6.0...8.0.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

tests/requirements.txt

@@ -1,5 +1,5 @@
 # Dependencies needed to run the tests
-pytest>=4.6,<8.0.0; python_version>"3.8.10"
+pytest>=4.6,<9.0.0; python_version>"3.8.10"
 pytest>=6.1.1,<6.2.0; python_version<="3.8.10"
 pytest-cov
 pytest-cases>=3.6.9,<4.0.0