cython coverage

[bjlittle]

With the introduction of codecov we've regressed in the cython code test coverage, let's fix that.

[bjlittle]

... btw my fault, sorry... but it may be just a codecov configuration setting 🤔

[github-actions]

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[bjlittle]

@HGWright Well, at least we now know that your env change to the GHA works 🥳

[github-actions]

In order to maintain a backlog of relevant issues, we automatically label them as stale after 500 days of inactivity.

If this issue is still important to you, then please comment on this issue and the stale label will be removed.

Otherwise this issue will be automatically closed in 28 days time.

[HGWright]

still relevant

[HGWright]

#43 states that it fixes this issue, is this fixed? @bjlittle