CONFIG: Update GitHub Actions to use Xcode 16

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.36%. Comparing base (08094ce) to head (f3ed920). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #189 +/- ## ========================================== - Coverage 89.47% 89.36% -0.12% ========================================== Files 203 203 Lines 2822 2820 -2 ========================================== - Hits 2525 2520 -5 - Misses 297 300 +3 ```

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