Update Codecov action to v5

[RMeli]

Update codecov action from v4 to v5 (changes deprecated variables to new values).

I suspect that the fix for #4576 would be to switch to token-less access, but I need to understand this better.

PR Checklist

• Tests?
• Docs?
• CHANGELOG updated?
• Issue raised/referenced?

Developers certificate of origin

• I certify that this contribution is covered by the LGPLv2.1+ license as defined in our LICENSE and adheres to the Developer Certificate of Origin.

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📚 Documentation preview 📚: https://mdanalysis--4887.org.readthedocs.build/en/4887/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.63%. Comparing base (d222720) to head (169f2b2).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4887      +/-   ##
===========================================
- Coverage    93.65%   93.63%   -0.03%     
===========================================
  Files          177      189      +12     
  Lines        21795    22861    +1066     
  Branches      3067     3067              
===========================================
+ Hits         20413    21406     +993     
- Misses         931     1004      +73     
  Partials       451      451              

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[RMeli]

Cycled PR after allowing tokenless uploads.

[RMeli]

Not 100% sure this improves things (the codecov/project test is still failing), but I think it doesn't hurt either to update to the latest codecov action.

[IAlibay]

Not 100% sure this improves things (the codecov/project test is still failing), but I think it doesn't hurt either to update to the latest codecov action.

So my take, and I admit I don't know 100%, but I believe the codecov/project failure makes sense. Your branch is a commit behind HEAD, so there's a difference in coverage between the two.