Bug 27673: (QA follow-up) Remove unused YAML::XS import

The last use of this module was removed in commit
"Bug 27673: Fix encoding issues - Dump".

Signed-off-by: Joonas Kylmälä <joonas.kylmala@helsinki.fi>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

reports/reserves_stats.pl

@@ -34,7 +34,6 @@ use Koha::ItemTypes;
 use Koha::Libraries;
 use Koha::Patron::Categories;
 use List::MoreUtils qw/any/;
-use YAML::XS;
 
 =head1 NAME