[CI] Switch macos version to keep the support of Xcode 15.4

[testableapple]

Test: https://github.com/GetStream/stream-chat-swift/actions/runs/15440883835

[coderabbitai]

Walkthrough

The GitHub Actions workflow configurations were updated to change the macOS runner version from "macos-15" to "macos-14" for several jobs across both the cron-checks and smoke-checks workflows. No other modifications to job steps, environment variables, or matrix configurations were made.

Changes

File(s)	Change Summary
.github/workflows/cron-checks.yml	Updated all job runner environments from macos-15 to macos-14. No other changes.
.github/workflows/smoke-checks.yml	Changed runner for "Automated Code Review" and "Build LLC + UI (Xcode 15)" to macos-14.

Poem

🐇
Hopping from fifteen down to fourteen,
Mac runners change, the jobs stay keen.
Workflows hum on a slightly older Mac,
Still on track, never looking back.
With every hop, CI stays bright—
Another day, another byte!

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between e28a758 and 83104c6.

📒 Files selected for processing (2)

• .github/workflows/cron-checks.yml (4 hunks)
• .github/workflows/smoke-checks.yml (2 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: Build Test App and Frameworks

🔇 Additional comments (6)

.github/workflows/smoke-checks.yml (2)

49-49: Runner platform updated for Automated Code Review
Switching from macos-15 to macos-14 aligns with supported GitHub runner labels for Xcode 15.4 builds.

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70-70: Runner platform updated for Xcode 15 build job
Changing the Build LLC + UI (Xcode 15) job to macos-14 ensures the correct environment for Xcode 15.4.

.github/workflows/cron-checks.yml (4)

31-31: Matrix OS updated for iOS 17.5 in Test E2E UI
The scheduled Test E2E UI (Debug) matrix now uses macos-14, matching the required environment for Xcode 15.4.

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104-104: Matrix OS updated for iOS 17.5 in Test LLC (Debug)
Aligning the build-and-test-debug matrix entry for iOS 17.5 with macos-14 ensures compatibility with Xcode 15.4.

---

151-151: Runner platform updated for Build LLC + UI job
Switching the build-old-xcode job to macos-14 standardizes the environment for Xcode 15.4 builds.

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178-178: Runner platform updated for Automated Code Review in cron workflow
Updating automated-code-review to macos-14 keeps the same Xcode 15.4 support in nightly cron runs.

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