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fix: upgrade Pytest 6.2.2 → 6.2.4

Python 3.10 was released on 2021-10-04 with what appears to be a breaking change.¹ Graphviz’ Windows CI tasks (intentionally) install an unpinned version of Python 3, so they get whatever the latest Python 3 version available on Chocolatey is. Python 3.10 became available in Chocolatey on 2021-10-05 and Windows CI tasks immediately started failing. The root cause is that 3.10 exposes a latent bug in Pytest.² This bug is reportedly fixed in Pytest 6.2.4, so upgrading should repair Windows CI.

¹ https://bugs.python.org/issue43798 ² https://github.com/pytest-dev/pytest/issues/8539


@magjac I'm hoping this fixes the issues you and I have been seeing all day.

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