Seltests / Containers / CI: Bump Fedora to 40

[richtja]

Because Fedora 38 is at the end of its life-cycle let's update the used Fedora images to 41 before the public package repositories will be removed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.16%. Comparing base (a24b10c) to head (a601e5a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6105   +/-   ##
=======================================
  Coverage   67.15%   67.16%           
=======================================
  Files         203      203           
  Lines       21977    21977           
=======================================
+ Hits        14759    14760    +1     
+ Misses       7218     7217    -1     

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[clebergnu]

Hi @richtja ,

I could still find many references to fedora:38 after this. Certainly they are in different contexts, but I see no reason not to bump the updates to either fedora:41 or fedora:40 (because of lack of Python 3 in stock images such as fedora:41.

And about not being able to use fedora:41 throughout, I've created the following issue: #6110

[richtja]

Hi @clebergnu, thanks for your review. I have changed this from fedora 41 to fedora 40, and I tried to add all fedora:38 occurrences. Please take a look.