What is the highest play-offs that have stevenage borough as the club, and a total greater than 21?
CREATE TABLE table_41423 (
    "Player" text,
    "Club" text,
    "League" real,
    "Play-offs" real,
    "FA Cup" real,
    "FA Trophy" real,
    "Total" real
)
SELECT MAX("Play-offs") FROM table_41423 WHERE "Club" = 'stevenage borough' AND "Total" > '21'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the highest play-offs that have stevenage borough as the club, and a total greater than 21? ### Input: CREATE TABLE table_41423 (
    "Player" text,
    "Club" text,
    "League" real,
    "Play-offs" real,
    "FA Cup" real,
    "FA Trophy" real,
    "Total" real
) ### Response: SELECT MAX("Play-offs") FROM table_41423 WHERE "Club" = 'stevenage borough' AND "Total" > '21'