Update dependency ubuntu to v26

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ubuntu	github-runner	major	24.04 → 26.04

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.19%. Comparing base (a31832b) to head (b30914e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6696   +/-   ##
=======================================
  Coverage   79.18%   79.19%           
=======================================
  Files         795      795           
  Lines       80380    80380           
=======================================
+ Hits        63652    63656    +4     
+ Misses      16723    16719    -4     
  Partials        5        5           

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