MDEV-29628 Memory leak after CREATE OR REPLACE with foreign key

MDEV-28933 added a condition to avoid keeping cached foreign keys when renaming into temporary table. Such foreign keys must be freed.

Author: midenok

storage/innobase/dict/dict0dict.cc

@@ -1804,6 +1804,8 @@ dict_table_rename_in_cache(
 foreign->referenced_table
 ->referenced_set.insert(foreign);
 }
+} else {
+dict_foreign_free(foreign);
 }
 }