Set backlog (#6867)

frameworks/Swift/hummingbird-core/src/Sources/server/main.swift

@@ -48,6 +48,7 @@ func runApp() throws {
     let configuration = HBHTTPServer.Configuration(
         address: .hostname(serverHostName, port: serverPort),
         serverName: "hb-core",
+        backlog: 8192,
         withPipeliningAssistance: false
     )
 

frameworks/Swift/hummingbird/src/Sources/server/main.swift

@@ -13,6 +13,7 @@ func runApp() throws {
     let configuration = HBApplication.Configuration(
         address: .hostname(serverHostName, port: serverPort),
         serverName: "Hummingbird",
+        backlog: 8192,
         enableHttpPipelining: false
     )
     let app = HBApplication(configuration: configuration)