Update to NIOTS 1.11.4 which fixes retain cycle bug (#541)

Author: vlm

Package.swift

@@ -25,7 +25,7 @@ let package = Package(
         .package(url: "https://github.com/apple/swift-nio-ssl.git", from: "2.14.1"),
         .package(url: "https://github.com/apple/swift-nio-http2.git", from: "1.19.0"),
         .package(url: "https://github.com/apple/swift-nio-extras.git", from: "1.10.0"),
-        .package(url: "https://github.com/apple/swift-nio-transport-services.git", from: "1.11.0"),
+        .package(url: "https://github.com/apple/swift-nio-transport-services.git", from: "1.11.4"),
         .package(url: "https://github.com/apple/swift-log.git", from: "1.4.0"),
     ],
     targets: [