Fix dead link in CODE_OF_CONDUCT.md

[ghost]

The old link is still under the 'prev' subdomain, but the link previously pointed to is now dead. Updated it to the current CoC from Rust

[squell]

Thanks for your attention to detail! (And taking the time to read the CoC).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c136211) 58.54% compared to head (558598f) 58.69%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #828      +/-   ##
==========================================
+ Coverage   58.54%   58.69%   +0.15%     
==========================================
  Files          75       75              
  Lines       10763    10791      +28     
==========================================
+ Hits         6301     6334      +33     
+ Misses       4462     4457       -5     

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