Off by one error in queue name length validation

[axelfontaine]

Code: https://github.com/tembo-io/pgmq/blob/main/pgmq-extension/sql/pgmq.sql#L593

  IF length(queue_name) >= 48 THEN
    RAISE EXCEPTION 'queue name is too long, maximum length is 48 characters';
  END IF;

Length of 48 triggers exception that the max length should be 48.

Either the check should be changed from >= to > or the rror message should say 47.