[CI] Fix iOS 15 setup

[testableapple]

The installation of iOS 15.5 Simulator on CI started failing, so changing it to 15.4.

Test: https://github.com/GetStream/stream-core-swift/actions/runs/22310306810/job/64540285417

Summary by CodeRabbit

• Chores
  • Updated testing configuration for iOS device compatibility checks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Review profile: CHILL

Plan: Pro

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📥 Commits

Reviewing files that changed from the base of the PR and between 266828d and b00ac91.

📒 Files selected for processing (1)

• .github/workflows/cron-checks.yml

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📝 Walkthrough

Walkthrough

The pull request modifies the continuous integration workflow to update the iOS version for iPhone 13 Pro testing from 15.5 to 15.4 in the matrix configuration.

Changes

Cohort / File(s)	Summary
CI Workflow Configuration .github/workflows/cron-checks.yml	Updated iPhone 13 Pro iOS version from 15.5 to 15.4 in the test matrix.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A version flip so light and small,
Fifteen-four now passes all!
The workflow hops with gentle care,
iPhone tests dance through the air. ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title '[CI] Fix iOS 15 setup' directly relates to the main change of updating the iOS version in the CI workflow configuration from 15.5 to 15.4.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ci/fix-ios-15

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