chore(deps-dev): bump pytest-cov from 4.0.0 to 4.1.0 in /backend

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 4.0.0 to 4.1.0.
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v4.0.0...v4.1.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

backend/dev-requirements.txt

@@ -7,7 +7,7 @@ isort==5.12.0
 mypy-protobuf==3.4.0
 parameterized==0.8.1
 pep8-naming==0.13.3
-pytest-cov==4.0.0
+pytest-cov==4.1.0
 pytest-mock==3.8.2
 pytest-django==4.5.2
 pytest-xdist[psutil]==3.2.1