fix: serial queues

Author: kwasniew

Sources/UnleashProxyClientSwift/Client/UnleashProxyClientSwift.swift

@@ -23,7 +23,7 @@ public class UnleashClientBase {
     var poller: Poller
     var metrics: Metrics
     var connectionId: UUID
-    private let queue = DispatchQueue(label: "com.unleash.clientbase", attributes: .concurrent)
+    private let queue = DispatchQueue(label: "com.unleash.clientbase")
 
     public init(
         unleashUrl: String,

Sources/UnleashProxyClientSwift/Poller/DictionaryStorageProvider.swift

@@ -2,7 +2,7 @@ import Foundation
 
 public class DictionaryStorageProvider: StorageProvider {
     private var storage: [String: Toggle] = [:]
-    private let queue = DispatchQueue(label: "com.unleash.storage", attributes: .concurrent)
+    private let queue = DispatchQueue(label: "com.unleash.storage")
 
     public init() {}