Use test.fixtures.version not test.conftest.version to avoid warnings

[dpkp]

Fixes pytest warning:

RemovedInPytest4Warning: Fixture "version" called directly.

Fixtures are not meant to be called directly, are created automatically
when test functions request them as parameters.
See https://docs.pytest.org/en/latest/fixture.html for more information.

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This change is 

[jeffwidman]

Thank you for this--it was bugging me a lot when I was workign on #1193 but I couldn't figure out what was triggering it... this is stupid simple. 🤦‍♂️