Update actions used in CI

[blegat]

No description provided.

[odow]

I learnt after the MOI PR that this should actually be @latest or @v2. There are still a few deprecation notices haha

[blegat]

v4 seems to be used in the template: https://github.com/JuliaCI/PkgTemplates.jl/blob/master/templates/github/workflows/CI.yml what's the issue ?

[odow]

No I meant julia-actions/setup-julia@v2

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.20%. Comparing base (69b1c51) to head (fb3d967).
Report is 3 commits behind head on master.

❗ Current head fb3d967 differs from pull request most recent head c249b10. Consider uploading reports for the commit c249b10 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #277      +/-   ##
==========================================
- Coverage   91.92%   89.20%   -2.72%     
==========================================
  Files          23       22       -1     
  Lines        2216     1974     -242     
==========================================
- Hits         2037     1761     -276     
- Misses        179      213      +34     

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