Amazon Lightsailで立ち上げたWordpressサーバーのSSL証明書は自動更新ができないっぽい
https://docs.aws.amazon.com/ja_jp/lightsail/latest/userguide/amazon-lightsail-using-lets-encrypt-certificates-with-wordpress.html#request-a
https://docs.aws.amazon.com/ja_jp/lightsail/latest/userguide/amazon-lightsail-using-lets-encrypt-certificates-with-wordpress.html#request-a