chore(deps): bump pytest from 7.4.4 to 9.0.2 in /backend

Bumps [pytest](https://github.com/pytest-dev/pytest) from 7.4.4 to 9.0.2.
- [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/7.4.4...9.0.2)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

backend/requirements.txt

@@ -48,7 +48,7 @@ prometheus-client==0.24.1
 python-json-logger==2.0.7
 
 # Development & Testing
-pytest==7.4.4
+pytest==9.0.2
 pytest-asyncio==0.23.3
 pytest-cov==4.1.0
 faker==22.6.0