ci: update freebsd to 15.0

[svmhdvn]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.04%. Comparing base (9f6cba4) to head (fc5f7c8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2586   +/-   ##
=======================================
  Coverage   72.03%   72.04%           
=======================================
  Files          66       66           
  Lines       36953    36953           
=======================================
+ Hits        26619    26622    +3     
+ Misses      10334    10331    -3     

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