Update pytest requirement from <8.0,>=6.1 to >=6.1,<9.0

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@6.1.0...8.1.1)

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

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

setup.cfg

@@ -60,7 +60,7 @@ dev =
     mypy >= 0.790
     pre-commit
     pydocstyle >= 5.1,< 7.0
-    pytest >= 6.1,< 8.0
+    pytest >= 6.1,< 9.0
     pytest-cov
     sphinx >= 3.3
     sphinx_compas_theme ~= 0.11