[PM-29092] Update CI to use Xcode 26.1.1

[fedemkr]

🎟️ Tracking

PM-29092

📔 Objective

Update CI to use Xcode 26.1.1.
Additionally, updated a reference to the Xcode version in a readme to point to the .xcode-version file.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[claude]

Claude encountered an error —— View job

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I'll analyze this and get back to you.

[github-actions]

Checkmarx One – Scan Summary & Details – 867826a6-8fa6-4c5a-b487-05758d0b6028

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.09%. Comparing base (b734949) to head (0d674ee).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2174      +/-   ##
==========================================
- Coverage   85.39%   84.09%   -1.30%     
==========================================
  Files        1731     1982     +251     
  Lines      145718   161115   +15397     
==========================================
+ Hits       124434   135491   +11057     
- Misses      21284    25624    +4340     

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