chore(deps): bump pytest-cov from 4.1.0 to 7.1.0 in /backend

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 4.1.0 to 7.1.0.
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-cov/compare/v4.1.0...v7.1.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-version: 7.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

backend/requirements.txt

@@ -50,7 +50,7 @@ python-json-logger==2.0.7
 # Development & Testing
 pytest==9.0.2
 pytest-asyncio==1.3.0
-pytest-cov==4.1.0
+pytest-cov==7.1.0
 faker==40.12.0
 
 # Utilities