Adding parentheses to the close function in MultiServiceAdapter (Scala3 needs that)

Author: peterbanda

openai-core/src/main/scala/io/cequence/openaiscala/service/OpenAIMultiServiceAdapter.scala

@@ -15,7 +15,7 @@ private trait OpenAIMultiServiceAdapter extends OpenAIServiceWrapper {
   ): Future[T] =
     fun(underlyings(calcIndex))
 
-  override def close =
+  override def close() =
     underlyings.foreach(_.close())
 }
 

openai-core/src/main/scala/io/cequence/openaiscala/service/OpenAIRetryServiceAdapter.scala

@@ -16,7 +16,6 @@ private class OpenAIRetryServiceAdapter(
     fun: OpenAIService => Future[T]
   ): Future[T] = {
     // need to use StackWalker to get the caller function name
-    fun.toString()
     val functionName = StackWalkerUtil.functionName(2).get()
     retry(s"${functionName.capitalize} call failed")(
       fun(underlying)