CI fails for 3.0.x and 2.2.x due to recent pytest version #12825
Description
Bug report
CI fails on branches 3.0.x and 2.2.x fails with
E _pytest.warning_types.RemovedInPytest4Warning: MarkInfo objects are deprecated as they contain merged marks which are hard to deal with correctly.
E Please use node.get_closest_marker(name) or node.iter_markers(name).
E Docs: https://docs.pytest.org/en/latest/mark.html#updating-code
This is due to a recent pytest version.
Solution: Either pin pytest<3.8 (I think that's the correct number) or backport #12154 (and maybe #12297).