fix[ci]: pin maturin due to fix upstream error

[joseph-isaacs]

the PR that was incorrect: PyO3/maturin#2901

However I think we should pin maturin going forward?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.97%. Comparing base (49b1634) to head (21e3834).
⚠️ Report is 1 commits behind head on develop.

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