Fix clippy warning and fix cargo-chef version

[flomonster]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.54%. Comparing base (f7b218a) to head (68346ae).

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #7721      +/-   ##
============================================
- Coverage     28.54%   28.54%   -0.01%     
  Complexity     2038     2038              
============================================
  Files          1243     1243              
  Lines        153525   153525              
  Branches       3008     3008              
============================================
- Hits          43826    43817       -9     
- Misses       107908   107917       +9     
  Partials       1791     1791              

Flag	Coverage Δ
core	75.03% <ø> (ø)
editoast	72.05% <ø> (-0.04%)	⬇️
front	9.83% <ø> (ø)
gateway	2.41% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	72.93% <ø> (ø)

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[emersion]

If we pin the clippy version, do we need to add the #[allow(dead_code)]? Is maybe this version the first to trigger the clippy check?

At any rate, LGTM!

[flomonster]

If we pin the clippy version, do we need to add the #[allow(dead_code)]? Is maybe this version the first to trigger the clippy check?

This is the first version to trigger the error.

[emersion]

Makes sense!