ci: updates for Rust 1.83

[davidhewitt]

Clippy warnings triggered in new Rust 1.83 release.

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.74%. Comparing base (2b67dd0) to head (ab6e41d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/jiter/src/python.rs	92.30%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #176   +/-   ##
=======================================
  Coverage   88.74%   88.74%           
=======================================
  Files          13       13           
  Lines        2203     2203           
  Branches     2203     2203           
=======================================
  Hits         1955     1955           
  Misses        153      153           
  Partials       95       95           

Files with missing lines	Coverage Δ
crates/jiter/src/string_decoder.rs	95.54% <100.00%> (ø)
crates/jiter/src/python.rs	90.86% <92.30%> (ø)

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[codspeed-hq]

CodSpeed Performance Report

Merging #176 will not alter performance

_{Comparing dh/rust-1.83 (ab6e41d) with main (2b67dd0)}

Summary

✅ 73 untouched benchmarks