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.

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);
 		}
 	}