Bump pytest-cov from 3.0.0 to 4.0.0 (#1606)

Author: dependabot[bot]

requirements/requirements_dev.txt

@@ -12,7 +12,7 @@ pre-commit==2.20.0
 pylint==2.17.0
 pytest==7.2.2
 pytest-black==0.3.12
-pytest-cov==3.0.0
+pytest-cov==4.0.0
 pytest-datadir==1.4.1
 pytest-mock==3.10.0
 pytest-pylint==0.18.0