Bump the version of pytest for compatibility with python 3.10

[ZedThree]

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Pytest 6.2.5 is the first version that supports python 3.10: https://pytest.org/en/latest/changelog.html#pytest-6-2-5-2021-08-29

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[AakashGfude]

Hi @ZedThree, I would suggest bump the version of pytest more, and pytest-cov as well. Like here: https://github.com/executablebooks/MyST-NB/blob/master/pyproject.toml#L103

[ZedThree]

Should I bump myst-nb version at the same time?

[AakashGfude]

@ZedThree, we will do that in a separate PR. It needs some additional testing.

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