lib/ur: Fix panic getting goroutines for failures (ref #7785) (#7890)

lib/ur/failurereporting.go

@@ -50,7 +50,7 @@ type FailureData struct {
 
 func FailureDataWithGoroutines(description string) FailureData {
 	var buf *strings.Builder
-	pprof.NewProfile("goroutine").WriteTo(buf, 1)
+	pprof.Lookup("goroutine").WriteTo(buf, 1)
 	return FailureData{
 		Description: description,
 		Goroutines:  buf.String(),