fix a crash when the network clock offset is negative

SessionMessagingKit/Jobs/Types/DisappearingMessagesJob.swift

@@ -110,7 +110,7 @@ public extension DisappearingMessagesJob {
         let userPublicKey: String = getUserHexEncodedPublicKey(db)
         let updateExpiryPublishers: [AnyPublisher<[String: UpdateExpiryResponseResult], Error>] = interactionExpirationInfosByExpiresInSeconds
             .map { expiresInSeconds, expirationInfos -> AnyPublisher<[String: UpdateExpiryResponseResult], Error> in
-                let expirationTimestampMs: UInt64 = UInt64(ceil(startedAtMs + expiresInSeconds * 1000))
+                let expirationTimestampMs: Int64 = Int64(ceil(startedAtMs + expiresInSeconds * 1000))
                 
                 return SnodeAPI
                     .updateExpiry(

SessionSnodeKit/Networking/SnodeAPI.swift

@@ -794,7 +794,7 @@ public final class SnodeAPI {
     public static func updateExpiry(
         publicKey: String,
         serverHashes: [String],
-        updatedExpiryMs: UInt64,
+        updatedExpiryMs: Int64,
         shortenOnly: Bool? = nil,
         extendOnly: Bool? = nil,
         using dependencies: SSKDependencies = SSKDependencies()
@@ -810,7 +810,7 @@ public final class SnodeAPI {
                 .eraseToAnyPublisher()
         }
         
-        let updatedExpiryMsWithNetworkOffset: UInt64 = (updatedExpiryMs + UInt64(SnodeAPI.clockOffsetMs.wrappedValue))
+        let updatedExpiryMsWithNetworkOffset: UInt64 = UInt64(updatedExpiryMs + SnodeAPI.clockOffsetMs.wrappedValue)
         
         return getSwarm(for: publicKey)
             .subscribe(on: Threading.workQueue)