我在 Digital Ocean LAMPSTACK droplet 升级到 22.04 后收到此消息：
The following packages have been kept back:
libapache2-mod-php7.4 php7.4-bz2 php7.4-cli php7.4-common php7.4-json php7.4-mbstring php7.4-opcache php7.4-readline php7.4-zip
9 packages can be upgraded. Run 'apt list --upgradable' to see them.
apt list --upgradable：
libapache2-mod-php7.4/jammy 8.1.2-1ubuntu2 amd64 [upgradable from: 7.4.28-1+ubuntu21.10.1+deb.sury.org+1]
php7.4-bz2/jammy 7.4.29-1+ubuntu22.04.1+deb.sury.org+1.9 amd64 [upgradable from: 7.4.28-1+ubuntu21.10.1+deb.sury.org+1]
php7.4-cli/jammy 7.4.29-1+ubuntu22.04.1+deb.sury.org+1.9 amd64 [upgradable from: 7.4.28-1+ubuntu21.10.1+deb.sury.org+1]
php7.4-common/jammy 7.4.29-1+ubuntu22.04.1+deb.sury.org+1.9 amd64 [upgradable from: 7.4.28-1+ubuntu21.10.1+deb.sury.org+1]
php7.4-json/jammy 7.4.29-1+ubuntu22.04.1+deb.sury.org+1.9 amd64 [upgradable from: 7.4.28-1+ubuntu21.10.1+deb.sury.org+1]
php7.4-mbstring/jammy 7.4.29-1+ubuntu22.04.1+deb.sury.org+1.9 amd64 [upgradable from: 7.4.28-1+ubuntu21.10.1+deb.sury.org+1]
php7.4-opcache/jammy 7.4.29-1+ubuntu22.04.1+deb.sury.org+1.9 amd64 [upgradable from: 7.4.28-1+ubuntu21.10.1+deb.sury.org+1]
php7.4-readline/jammy 7.4.29-1+ubuntu22.04.1+deb.sury.org+1.9 amd64 [upgradable from: 7.4.28-1+ubuntu21.10.1+deb.sury.org+1]
php7.4-zip/jammy 7.4.29-1+ubuntu22.04.1+deb.sury.org+1.9 amd64 [upgradable from: 7.4.28-1+ubuntu21.10.1+deb.sury.org+1]
我有 PHP-FPM。
php -v：
PHP 8.1.5 (cli) (built: Apr 21 2022 10:32:13) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.1.5, Copyright (c) Zend Technologies
with Zend OPcache v8.1.5, Copyright (c), by Zend Technologies
该怎么办？