Bump proc-macro-error

[divarvel]

Following https://rustsec.org/advisories/RUSTSEC-2024-0370

A second commit fixes the feature gate for bwk.

[codspeed-hq]

CodSpeed Performance Report

Merging #227 will not alter performance

_{Comparing bump-proc-macro-error (feb4a74) with main (61a12b0)}

Summary

✅ 12 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.31%. Comparing base (61a12b0) to head (feb4a74).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #227      +/-   ##
==========================================
+ Coverage   67.19%   67.31%   +0.11%     
==========================================
  Files          25       25              
  Lines        5274     5274              
==========================================
+ Hits         3544     3550       +6     
+ Misses       1730     1724       -6     

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