Bump pytest from 4.3.1 to 9.0.3 in /src/tests

Bumps [pytest](https://github.com/pytest-dev/pytest) from 4.3.1 to 9.0.3.
- [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/4.3.1...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>

src/tests/requirements.txt

@@ -1,2 +1,2 @@
-pytest==4.3.1
+pytest==9.0.3
 tox