chore: Bump Xcode version in CI

[cbaker6]

New Pull Request Checklist

• I am not disclosing a vulnerability.
• I am creating this PR in reference to an issue.

Issue Description

Approach

TODOs before merging

• Add tests
• Add entry to changelog
• Add changes to documentation (guides, repository pages, in-code descriptions)

[codecov]

Codecov Report

Merging #134 (6e8c818) into main (fc516a6) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #134      +/-   ##
==========================================
+ Coverage   91.33%   91.35%   +0.01%     
==========================================
  Files         175      175              
  Lines       15466    15466              
==========================================
+ Hits        14126    14129       +3     
+ Misses       1340     1337       -3     

see 2 files with indirect coverage changes