In the iOS SimpleChatbot, fix @MainActor-related warnings (which would be errors in Swift 6). The delegate methods aren't contractually guaranteed to run on the main thread, so we can't mark them as @MainActor.

examples/simple-chatbot/examples/ios/SimpleChatbot/model/CallContainerModel.swift

@@ -127,55 +127,73 @@ extension CallContainerModel:RTVIClientDelegate, LLMHelperDelegate {
     }
     
     func onTransportStateChanged(state: TransportState) {
+        Task { @MainActor in
             self.handleEvent(eventName: "onTransportStateChanged", eventValue: state)
             self.voiceClientStatus = state.description
             self.isInCall = ( state == .connecting || state == .connected || state == .ready || state == .authenticating )
         }
+    }
     
-    @MainActor
     func onBotReady(botReadyData: BotReadyData) {
+        Task { @MainActor in
             self.handleEvent(eventName: "onBotReady.")
             self.isBotReady = true
             if let expirationTime = self.rtviClientIOS?.expiry() {
                 self.startTimer(withExpirationTime: expirationTime)
             }
         }
+    }
     
-    @MainActor
     func onConnected() {
+        Task { @MainActor in
             self.isMicEnabled = self.rtviClientIOS?.isMicEnabled ?? false
         }
+    }
     
     func onDisconnected() {
+        Task { @MainActor in
             self.stopTimer()
             self.isBotReady = false
         }
+    }
     
     func onRemoteAudioLevel(level: Float, participant: Participant) {
+        Task { @MainActor in
             self.remoteAudioLevel = level
         }
+    }
     
     func onUserAudioLevel(level: Float) {
+        Task { @MainActor in
             self.localAudioLevel = level
         }
+    }
     
     func onUserTranscript(data: Transcript) {
+        Task { @MainActor in
             if (data.final ?? false) {
                 self.handleEvent(eventName: "onUserTranscript", eventValue: data.text)
             }
         }
+    }
     
     func onBotTranscript(data: String) {
+        Task { @MainActor in
             self.handleEvent(eventName: "onBotTranscript", eventValue: data)
         }
+    }
     
     func onError(message: String) {
+        Task { @MainActor in
             self.handleEvent(eventName: "onError", eventValue: message)
             self.showError(message: message)
         }
+    }
     
     func onTracksUpdated(tracks: Tracks) {
+        Task { @MainActor in
             self.handleEvent(eventName: "onTracksUpdated", eventValue: tracks)
         }
+    }
     
 }