Bump pytest-flake8 from 1.0.6 to 1.0.7 (#673)

Author: dependabot[bot]

requirements/requirements_dev.txt

@@ -14,6 +14,6 @@ pytest==6.2.1
 pytest-black==0.3.12
 pytest-cov==2.10.1
 pytest-datadir==1.3.1
-pytest-flake8==1.0.6
+pytest-flake8==1.0.7
 pytest-mock==3.4.0
 pytest-pylint==0.17.0