lang: update bluelib api usage

lang/codegen/var-map.c

@@ -1,7 +1,7 @@
 #include "var-map.h"
 
-#include <blue/object/hashmap.h>
-#include <blue/object/string.h>
+#include <blue/ds/hashmap.h>
+#include <blue/ds/string.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -15,7 +15,7 @@ enum ivy_status codegen_var_map_init(struct codegen_var_map *map)
 
 enum ivy_status codegen_var_map_fini(struct codegen_var_map *map)
 {
-	b_hashmap_release(map->m_map);
+	b_hashmap_unref(map->m_map);
 	return IVY_OK;
 }