Bump pytest from 8.3.5 to 9.0.0 in /client

Bumps [pytest](https://github.com/pytest-dev/pytest) from 8.3.5 to 9.0.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@8.3.5...9.0.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

client/pyproject.toml

@@ -34,7 +34,7 @@ certgrinder = "certgrinder.certgrinder:main"
 
 [project.optional-dependencies]
 dev = ["twine == 6.1.0", "pre-commit == 4.2.0", "setuptools-scm == 8.3.1", "build==1.2.2.post1"]
-test = ["pytest == 8.3.5", "pytest-cov==6.1.1", "tox == 4.26.0"]
+test = ["pytest == 9.0.0", "pytest-cov==6.1.1", "tox == 4.26.0"]
 docs = ["Sphinx==8.2.3", "sphinx-rtd-theme==3.0.2", "sphinx-argparse==0.4.0"]
 
 [project.urls]