chore: update justfile

[shaneutt]

Updates CI to rust 2024 edition rustfmt, and rustc 1.91.0.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 74.6%. Comparing base (7c63f56) to head (d3caa7e).

Files with missing lines	Patch %	Lines
kube-core/src/schema.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1842     +/-   ##
=======================================
+ Coverage   74.5%   74.6%   +0.1%     
=======================================
  Files         84      84             
  Lines       7877    7877             
=======================================
+ Hits        5867    5871      +4     
+ Misses      2010    2006      -4     

Files with missing lines	Coverage Δ
kube-core/src/schema.rs	95.2% <0.0%> (ø)

... and 3 files with indirect coverage changes

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