Updated the coverage build to use gcc-14

[anarthal]

Workarounds a problem with the build-gcc13 container, which uses a non-LTS Ubuntu release and can't be installed packages

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.95%. Comparing base (f6c1192) to head (0e5ddce).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #382      +/-   ##
===========================================
- Coverage    99.02%   98.95%   -0.07%     
===========================================
  Files          143      142       -1     
  Lines         7157     7185      +28     
===========================================
+ Hits          7087     7110      +23     
- Misses          70       75       +5     

see 18 files with indirect coverage changes

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