Update ubuntu Docker tag to v26

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ubuntu	final	major	noble → resolute

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.75%. Comparing base (ba1289f) to head (a15da14).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #95   +/-   ##
=======================================
  Coverage   86.75%   86.75%           
=======================================
  Files          15       15           
  Lines         536      536           
=======================================
  Hits          465      465           
  Misses         71       71           

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