Update pytest requirement from ==7.* to ==8.*

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](https://github.com/pytest-dev/pytest/compare/7.0.0rc1...8.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements.test.txt

@@ -1,3 +1,3 @@
-pytest==7.*
+pytest==8.*
 coverage==7.*
 pytest-asyncio==0.*