Bump pytest-cov from 2.11.1 to 2.12.0 (#85)

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)

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

Author: dependabot-preview[bot]

poetry.lock

@@ -56,7 +56,7 @@ nitpick = "^0.26.0"
 safety = "^1.10"
 
 pytest = "^6.2"
-pytest-cov = "^2.11"
+pytest-cov = "^2.12"
 pytest-randomly = "^3.8"
 pytest-mypy-plugins = "^1.6"