[MM-57356] Make use of go1.21 features (#26620)

server/channels/store/sqlstore/channel_bookmark_store.go

@@ -4,15 +4,15 @@
 package sqlstore
 
 import (
+	"slices"
 	"strconv"
 
 	sq "github.com/mattermost/squirrel"
+	"github.com/pkg/errors"
 
 	"github.com/mattermost/mattermost/server/public/model"
 	"github.com/mattermost/mattermost/server/v8/channels/store"
 	"github.com/mattermost/mattermost/server/v8/channels/utils"
-
-	"github.com/pkg/errors"
 )
 
 type SqlChannelBookmarkStore struct {
@@ -262,7 +262,7 @@ func (s *SqlChannelBookmarkStore) UpdateSortOrder(bookmarkId, channelId string,
 	}
 
 	bookmarks = utils.RemoveElementFromSliceAtIndex(bookmarks, currentIndex)
-	bookmarks = utils.InsertElementToSliceAtIndex(bookmarks, current, int(newIndex))
+	bookmarks = slices.Insert(bookmarks, int(newIndex), current)
 	caseStmt := sq.Case()
 	query := s.getQueryBuilder().
 		Update("ChannelBookmarks")