pytest-cov is incompatible with pytest-xdist 3.x due to injection of rsync option

[ssbarnea]

Summary

See pytest-dev/pytest-xdist#825 (comment) which reports a deprecation option related to rsyncdir(s) options. This breaks the builds for anyone that run with warnings-as-errors.

Code

pytest-cov/src/pytest_cov/engine.py

Line 263 in f7fced5

self.config.option.rsyncdir.append(self.cov_config)

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Solution

We need to stop adding this option on newer versions as it was already deprecated and will be removed on next version of xdist.