Bump pytest-cov from 2.10.1 to 2.11.1 (#429)

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>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Mariatta Wijaya <Mariatta@users.noreply.github.com>

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -3,5 +3,5 @@ coverage
 pytest==6.1.2
 pytest-asyncio==0.14.0
 pytest-aiohttp==0.3.0
-pytest-cov==2.10.1
+pytest-cov==2.11.1
 codecov==2.1.11