Use ubuntu-26.04 image for code coverage reporting

[rmisev]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.64%. Comparing base (d5d7971) to head (61261b3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #203      +/-   ##
==========================================
- Coverage   99.64%   99.64%   -0.01%     
==========================================
  Files          21       21              
  Lines        3698     3696       -2     
  Branches      623      665      +42     
==========================================
- Hits         3685     3683       -2     
  Misses         13       13              

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