Bump pytest-cov from 2.11.1 to 2.12.0

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.11.1 to 2.12.0.
- [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@v2.11.1...v2.12.0)

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

requirements-test.txt

@@ -4,7 +4,7 @@ flake8==3.9.2
 isort==5.8.0
 mypy==0.812
 pytest==6.2.4
-pytest-cov==2.11.1
+pytest-cov==2.12.0
 pytest-mock==3.6.1
 pdbpp==0.10.2
 pydocstyle==6.0.0