Bump pytest-cov from 2.11.0 to 2.11.1 (#110)

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.11.0 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@v2.11.0...v2.11.1)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements_test.txt

@@ -7,4 +7,4 @@ mypy==0.800
 pylint==2.6.0
 pytest==6.2.2
 pytest-asyncio==0.14.0
-pytest-cov==2.11.0
+pytest-cov==2.11.1