[MBL-19676][S/P/T] Upgrade to Xcode 26.4

[petkybenedek]

refs: MBL-19676
builds: Student, Parent, Teacher
affects: Student, Parent, Teacher
release note: none

Changes

• weak let: From now, weak var generates a build warning saying that it should be weak let.
• Default view parameters: An error appeared indicating that that Label's type inference is ambiguous.
• Bitrise stamps prevented the build. Since they were not working since the new app icons, I removed the step after consulting with @vargaat.
• Module verifier was recommended for Core and Horizon. It did not cause problems, but according to this article, it may help catching runtime errors.

Checklist

• Follow-up e2e test ticket created
• A11y checked
• Tested on phone
• Tested on tablet
• Tested in dark mode
• Tested in light mode
• Approve from product

[bitrise]

Builds

Commit: Horzion TestsFoundation dependency (dbed883)
Build Number: 1791
Built At: Apr 14 12:24 CEST (04/14 04:24 AM MDT)

Student

Teacher

Parent

[github-actions]

PR Checks

Commit: Horzion TestsFoundation dependency (dbed883)
Built At: Apr 14 10:23 UTC (04/14 04:23 AM MDT)

✅ PR Description

✅ Copyright Headers

✅ SwiftLint

✅ Build CITests

✅ Unit Tests

✅ Code Coverage

[vargaat]

• .github/workflows/pr-checks.yml also need to be updated

[rh12]

Code + 1

[vargaat]

• Could we also get these warnings fixed?
  
  
• The export translations script also fails since I updated the stack to the new Xcode, please also take a look on that.

[petkybenedek]

Addressed weak var warnings, throw warning and missing TestsFoundation dependency. Firebase dependency warnings can be solved by updating firebase. Checked on the dependency update PR and it seems to be solved.

[rh12]

QA + 1