build(deps): update pytest requirement from >=6.0.0 to >=9.0.3

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@6.0.0...9.0.3)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.0.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements-testing.txt

@@ -1,5 +1,5 @@
 pip
-pytest>=6.0.0
+pytest>=9.0.3
 tomli;python_version<"3.11"  # Only needed for pytest on Python < 3.11
 pytest-cov
 pytest-forked