rework ci (speed up)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (3c50162) 82.59% compared to head (d8fbc8d) 82.59%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #109 +/- ## ======================================= Coverage 82.59% 82.59% ======================================= Files 20 20 Lines 2700 2701 +1 Branches 338 350 +12 ======================================= + Hits 2230 2231 +1 Misses 390 390 Partials 80 80 ``` | [Files](https://app.codecov.io/gh/Quantmetry/qolmat/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Quantmetry) | Coverage Δ | | |---|---|---| | [qolmat/imputations/em\_sampler.py](https://app.codecov.io/gh/Quantmetry/qolmat/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Quantmetry#diff-cW9sbWF0L2ltcHV0YXRpb25zL2VtX3NhbXBsZXIucHk=) | `87.37% <ø> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/Quantmetry/qolmat/pull/109/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Quantmetry)

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