Added MainActor annotation for matches UIApplication.beginBackgroundTask(expirationHandler:)

[yochidros]

What and why?

This fix addresses a build error in Xcode 16. The error occurs when building my app and the message is:

Type 'UIApplication' does not conform to protocol 'UIKitAppBackgroundTaskCoordinator'

The error logs provide more details:

UIKit.UIApplication:70:27: note: candidate has non-matching type '((@MainActor () -> Void)?) -> UIBackgroundTaskIdentifier'

nonisolated open func beginBackgroundTask(expirationHandler handler: (@MainActor () -> Void)? = nil) -> UIBackgroundTaskIdentifier

It seems that type checking has become more strict in Xcode 16 and Swift 6.0.

fix issue #1892

How?

just added annotation MainActor into expirationHander in UIKitAppBackgroundTaskCoordinator.beginBackgroundTask(expirationHandler:)

Review checklist

• Feature or bugfix MUST have appropriate tests (unit, integration)
• Make sure each commit and the PR mention the Issue number or JIRA reference
• Add CHANGELOG entry for user facing changes

Custom CI job configuration (optional)

• Run unit tests for Core, RUM, Trace, Logs, CR and WVT
• Run unit tests for Session Replay
• Run integration tests
• Run smoke tests
• Run tests for tools/

[maciejburda]

We decided to follow this approach: #1898

But thank you for suggesting the change! 🙇