Bump pytest-cov from 2.10.0 to 2.10.1 in /backend

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.10.0 to 2.10.1.
- [Release notes](https://github.com/pytest-dev/pytest-cov/releases)
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v2.10.0...v2.10.1)

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

Author: dependabot-preview[bot]

backend/requirements.txt

@@ -7,4 +7,4 @@ gunicorn==20.0.4
 pycrypto==2.6.1
 parameterized==0.7.4
 pytest==6.0.1
-pytest-cov==2.10.0
+pytest-cov==2.10.1