Bump pytest from 6.0.0 to 6.0.1 in /backend

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.0.0 to 6.0.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@6.0.0...6.0.1)

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

Author: dependabot-preview[bot]

backend/requirements.txt

@@ -6,5 +6,5 @@ Flask-Login==0.5.0
 gunicorn==20.0.4
 pycrypto==2.6.1
 parameterized==0.7.4
-pytest==6.0.0
+pytest==6.0.1
 pytest-cov==2.10.0