Fix small linting errors

Author: cschleiden

workflow/subworkflow.go

@@ -42,7 +42,7 @@ func CreateSubWorkflowInstance[TResult any](ctx Context, options SubWorkflowOpti
 	})
 }
 
-func createSubWorkflowInstance[TResult any](ctx Context, options SubWorkflowOptions, attempt int, wf Workflow, args ...any) Future[TResult] {
+func createSubWorkflowInstance[TResult any](ctx Context, options SubWorkflowOptions, _ int, wf Workflow, args ...any) Future[TResult] {
 	f := sync.NewFuture[TResult]()
 
 	// If the context is already canceled, return immediately.

workflow/tracer.go

@@ -89,7 +89,7 @@ func start(ctx Context, name string, opts ...trace.SpanStartOption) (sync.Contex
 
 	// Use workflow timestamp
 	opts = append(opts, trace.WithTimestamp(state.Time()))
-	sctx, span := tracer.Start(sctx, name, opts...)
+	_, span := tracer.Start(sctx, name, opts...)
 
 	return tracing.ContextWithSpan(ctx, span), &wfSpan{span, state}
 }