feat: migrate to XcodeProj 9.12.0

[wojciech-kulik]

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[codecov-commenter]

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Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.38%. Comparing base (06c5920) to head (7b088f2).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/XcodeProject/Core/ProjectTargets.swift	90.90%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   95.47%   95.38%   -0.09%     
==========================================
  Files          39       39              
  Lines         972      975       +3     
==========================================
+ Hits          928      930       +2     
- Misses         44       45       +1     

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