[CI] Simplify CI binaries updating

[Luni-4]

Pull Request Template

Checklist

• Confirmed that run-checks all script has been executed.
• Made sure the book is up to date with changes in this PR.

Changes

• Use latest keyword instead of a specific tag for the binaries that allow this trick
• Move the version variable at the top of the yml files, so it's simpler to update their versions

[syl20bnr]

Let's always pin a version when we can.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9df2071) 84.41% compared to head (a427a6e) 84.38%.
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1235      +/-   ##
==========================================
- Coverage   84.41%   84.38%   -0.03%     
==========================================
  Files         549      549              
  Lines       61952    61954       +2     
==========================================
- Hits        52295    52281      -14     
- Misses       9657     9673      +16     

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