Remove printf

[fwesselm]

Description

Remove printf from highs/simplex/HEkk.cpp.

Checklist

• I have read the contributing guidelines
• This PR targets the latest branch
• Tests are passing
• Documentation was updated where relevant
• This PR is not primarily AI-generated (per the AI contributions policy in CONTRIBUTING.md)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.23%. Comparing base (d7c50d1) to head (2558084).
⚠️ Report is 4 commits behind head on latest.

Additional details and impacted files

@@            Coverage Diff             @@
##           latest    #3240      +/-   ##
==========================================
- Coverage   73.23%   73.23%   -0.01%     
==========================================
  Files         445      445              
  Lines      108019   108043      +24     
  Branches    17318    17321       +3     
==========================================
+ Hits        79106    79120      +14     
- Misses      28637    28647      +10     
  Partials      276      276              

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[jajhall]

Thanks