chore: bump pytest-cov from 2.10.1 to 2.11.1

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.10.1 to 2.11.1.
- [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@v2.10.1...v2.11.1)

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

requirements/dev.txt

@@ -6,7 +6,7 @@ flake8==3.8.4
 sphinx-rtd-theme==0.5.0
 pylint==2.6.0
 pytest==6.1.2
-pytest-cov==2.10.1
+pytest-cov==2.11.1
 pytest-django==4.1.0
 pytest-pylint==0.18.0
 python-decouple==3.4