Replace withUnsafeContinuation with withCheckedContinuation in pendingWorkComplete#159
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…ion in DispatchQueue.pendingWorkComplete
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This PR updates the pendingWorkComplete helper on DispatchQueue to use withCheckedContinuation instead of withUnsafeContinuation.
Why
• withCheckedContinuation enforces at runtime that the continuation is resumed exactly once, helping catch mistakes early.
• Safer default for async APIs, consistent with modern Swift concurrency best practices.
• The original code included a TODO referencing apple/swift#74206, which is now resolved.
What’s changed
• Replaced withUnsafeContinuation with withCheckedContinuation in DispatchQueue.pendingWorkComplete.
• Added a test case (DispatchQueuePendingWorkTests) to verify that the function waits for queued work to complete before returning.
How it was tested
• Ran swift test locally; new test passes.
• Verified that the continuation is resumed correctly and that the async work is completed before returning.