docs: update.sql更新

src/main/resources/update.sql

@@ -3,3 +3,6 @@ set u.password = md5(sha2(from_base64(u.password), 256));
 
 update course c
 set c.code = from_base64(c.code);
+
+update admin
+set password = md5(sha2(from_base64(password), 256));