Merge branch 'main' of https://github.com/livekit/client-sdk-swift

Author: hiroshihorie

Sources/LiveKit/Types/Statistics.swift

@@ -575,7 +575,8 @@ public class InboundRtpStreamStatistics: ReceivedRtpStreamStatistics {
     public let retransmittedPacketsReceived: UInt64?
     public let retransmittedBytesReceived: UInt64?
 
-    public let previous: InboundRtpStreamStatistics?
+    // Weak reference to previous stat so we can compare later.
+    public weak var previous: InboundRtpStreamStatistics?
 
     init?(id: String,
           timestamp: Double,
@@ -720,7 +721,8 @@ public class OutboundRtpStreamStatistics: SentRtpStreamStatistics {
     public let active: Bool?
     public let scalabilityMode: String?
 
-    public let previous: OutboundRtpStreamStatistics?
+    // Weak reference to previous stat so we can compare later.
+    public weak var previous: OutboundRtpStreamStatistics?
 
     init?(id: String,
           timestamp: Double,