Clippy fix

[NiklasVousten]

Solves issue with missing cfg(PyPy), and so on

Updating the pyo3-build-config crate was enough.
Additionally cargo update was run

Added #[cfg(unix)] to pyo3_bindgen_macros utils.rs to fix unused import error

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.55%. Comparing base (64c64a5) to head (1425361).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
- Coverage   66.77%   66.55%   -0.22%     
==========================================
  Files          22       22              
  Lines        3211     3199      -12     
==========================================
- Hits         2144     2129      -15     
- Misses       1067     1070       +3     

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[AndrejOrsula]

Great! Thanks a lot, @NiklasVousten, for your contributions!