chore: fix linter warnings after upgrading Clippy

[haraldmaida]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.92%. Comparing base (b24b44a) to head (25e7dcd).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/spec/mod.rs	0.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
- Coverage   87.95%   87.92%   -0.03%     
==========================================
  Files          42       42              
  Lines        6649     6636      -13     
  Branches     6649     6636      -13     
==========================================
- Hits         5848     5835      -13     
  Misses        731      731              
  Partials       70       70              

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