Fix running codecov only on ubuntu-latest for Julia 1

[abelsiqueira]

Pull request details

Describe the changes made in this pull request

Tentative solution to show the badge on codecov.
The src/TulipaEnergyModel.jl change is insignificant just to trigger the TestOnPR.yml workflow.

List of related issues or pull requests

Maybe fix #422, have to check after merging.

Collaboration confirmation

As a contributor I confirm

• I read and followed the instructions in README.dev.md
• The documentation is up to date with the changes introduced in this Pull Request (or NA)
• Tests are passing
• Lint is passing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1d680ca) 100.00% compared to head (9918c44) 100.00%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #423   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          414       414           
=========================================
  Hits           414       414           

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[datejada]

LGTM