Revert "Revert: break the build"

This reverts commit 0e3ef53.

Author: pblazej

Sources/LiveKit/Extensions/AVAudioPCMBuffer.swift

@@ -48,12 +48,12 @@ public extension AVAudioPCMBuffer {
             return nil
         }
 
-//        #if swift(>=6.0)
-//        // Won't be accessed concurrently, marking as nonisolated(unsafe) to avoid Atomics.
-//        nonisolated(unsafe) var isDone = false
-//        #else
+        #if swift(>=6.0)
+        // Won't be accessed concurrently, marking as nonisolated(unsafe) to avoid Atomics.
+        nonisolated(unsafe) var isDone = false
+        #else
         var isDone = false
-//        #endif
+        #endif
         let inputBlock: AVAudioConverterInputBlock = { _, outStatus in
             if isDone {
                 outStatus.pointee = .noDataNow

Sources/LiveKit/Extensions/Sendable.swift

@@ -41,13 +41,13 @@ extension LKRTCSessionDescription: @unchecked Swift.Sendable {}
 extension LKRTCStatisticsReport: @unchecked Swift.Sendable {}
 extension LKRTCVideoCodecInfo: @unchecked Swift.Sendable {}
 extension LKRTCVideoFrame: @unchecked Swift.Sendable {}
-// extension LKRTCRtpCapabilities: @unchecked Swift.Sendable {}
+extension LKRTCRtpCapabilities: @unchecked Swift.Sendable {}
 
 // MARK: Mutable classes - to be validated
 
 extension LKRTCConfiguration: @unchecked Swift.Sendable {}
 extension LKRTCVideoCapturer: @unchecked Swift.Sendable {}
-// extension LKRTCDefaultAudioProcessingModule: @unchecked Swift.Sendable {}
+extension LKRTCDefaultAudioProcessingModule: @unchecked Swift.Sendable {}
 
 // MARK: Collections