Bump pytest-cov from 2.11.0 to 2.11.1 (#729)

Author: dependabot[bot]

requirements/requirements_dev.txt

@@ -12,7 +12,7 @@ pre-commit==2.10.1
 pylint==2.6.0
 pytest==6.2.2
 pytest-black==0.3.12
-pytest-cov==2.11.0
+pytest-cov==2.11.1
 pytest-datadir==1.3.1
 pytest-flake8==1.0.7
 pytest-mock==3.5.1