CI update to pytest 6.1 breaks [tool:pytest] config options #10773

Description

circleci and travis just seem to have updated their pytest to 6.1.0, which fails on all installations on some setup.cfg options in [tool:pytest]:
INTERNALERROR> pytest.PytestConfigWarning: Unknown config option: asdf_schema_root

INTERNALERROR> pytest.PytestConfigWarning: Unknown config option: qt_no_exception_capture

Steps to Reproduce

see https://circleci.com/gh/astropy/astropy/76632 and https://travis-ci.org/github/astropy/astropy/builds/730653402

The failure/fatal warning has been moved to an earlier stage with 6.1, and I could fix this locally by extending #10730.