Update GitHub workflow config yml

[GMinucci]

What does this PR do

Update Github's CI workflow configuration file to use latest Xcode app.

Sidenote:

1. The UnitTests were failing due to mkpath() in the test testFileWrite_correctOutput from FastlaneParametersFactoryTests. This was happening due to the method creating the complete path as a directory, resulting in the file being created as a directory.
2. Small refactor in the AndroidProjectTests and iOSProjectTests classes to improve readability.

How can it be tested

This updates the CI config so no test is required as long as the CI is working.

Task

Fixes #160

Checklist:

• I ran make validation locally with success
• I have not introduced new bugs
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new errors

[codecov]

Codecov Report

Merging #161 (e564db4) into develop (26d3524) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #161   +/-   ##
========================================
  Coverage    58.36%   58.36%           
========================================
  Files           31       31           
  Lines         1172     1172           
  Branches       411      411           
========================================
  Hits           684      684           
  Misses         451      451           
  Partials        37       37           

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