graph: replace custom reverse logic with slices.Reverse

graph/community/louvain_directed_multiplex_test.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"math"
 	"reflect"
+	"slices"
 	"sort"
 	"testing"
 
@@ -608,7 +609,7 @@ func TestLouvainDirectedMultiplex(t *testing.T) {
 			}
 
 			// Recovery of Q values is reversed.
-			if reverse(qs); !sort.Float64sAreSorted(qs) {
+			if slices.Reverse(qs); !sort.Float64sAreSorted(qs) {
 				t.Errorf("Q values not monotonically increasing: %.5v", qs)
 			}
 		}