Replace sort.Sort with sort.Ints

Fix staticcheck issue

Author: lelenanam

internal/pqueue/pqueue_test.go

@@ -49,7 +49,7 @@ func TestUnsortedInsert(t *testing.T) {
 	equal(t, pq.Len(), c)
 	equal(t, cap(pq), c)
 
-	sort.Sort(sort.IntSlice(ints))
+	sort.Ints(ints)
 
 	for i := 0; i < c; i++ {
 		item, _ := pq.PeekAndShift(int64(ints[len(ints)-1]))

nsqd/in_flight_pqueue_test.go

@@ -39,7 +39,7 @@ func TestUnsortedInsert(t *testing.T) {
 	test.Equal(t, c, len(pq))
 	test.Equal(t, c, cap(pq))
 
-	sort.Sort(sort.IntSlice(ints))
+	sort.Ints(ints)
 
 	for i := 0; i < c; i++ {
 		msg, _ := pq.PeekAndShift(int64(ints[len(ints)-1]))