make OpenAPILambdaHandler sendable again

Author: sebsto

Sources/OpenAPILambdaHandler.swift

@@ -18,7 +18,7 @@ import OpenAPIRuntime
 import HTTPTypes
 
 /// Specialization of LambdaHandler which runs an OpenAPILambda
-public struct OpenAPILambdaHandler<OALS: OpenAPILambdaService>: LambdaHandler {
+public struct OpenAPILambdaHandler<OALS: OpenAPILambdaService>: LambdaHandler, Sendable {
 
     private let router: OpenAPILambdaRouter
     private let transport: OpenAPILambdaTransport