Remove deprecated TLSConfig.forClient() function

Author: adam-fowler

Tests/MQTTNIOTests/MQTTNIOTests.swift

@@ -474,11 +474,11 @@ final class MQTTNIOTests: XCTestCase {
             let rootCertificate = try NIOSSLCertificate.fromPEMFile(MQTTNIOTests.rootPath + "/mosquitto/certs/ca.crt")
             let certificate = try NIOSSLCertificate.fromPEMFile(MQTTNIOTests.rootPath + "/mosquitto/certs/client.crt")
             let privateKey = try NIOSSLPrivateKey(file: MQTTNIOTests.rootPath + "/mosquitto/certs/client.key", format: .pem)
-            let tlsConfiguration = TLSConfiguration.forClient(
-                trustRoots: .certificates(rootCertificate),
-                certificateChain: certificate.map { .certificate($0) },
-                privateKey: .privateKey(privateKey)
-            )
+            var tlsConfiguration = TLSConfiguration.makeClientConfiguration()            
+            tlsConfiguration.trustRoots = .certificates(rootCertificate)
+            tlsConfiguration.certificateChain = certificate.map { .certificate($0) }
+            tlsConfiguration.privateKey = .privateKey(privateKey)
+
             return .success(.niossl(tlsConfiguration))
 
             #else