Update the SDK.

Handles changes that removed support for the sliding sync proxy.

ElementX/Sources/Services/Client/ClientProxyProtocol.swift

@@ -75,9 +75,11 @@ protocol ClientProxyProtocol: AnyObject, MediaLoaderProtocol {
     var deviceID: String? { get }
 
     var homeserver: String { get }
-
+    
+    // TODO: This is a temporary value, in the future we should throw a migration error
+    // when decoding a session that contains a sliding sync proxy URL instead of restoring it.
+    var needsSlidingSyncMigration: Bool { get }
     var slidingSyncVersion: SlidingSyncVersion { get }
-    var availableSlidingSyncVersions: [SlidingSyncVersion] { get async }
     
     var canDeactivateAccount: Bool { get }