mismatch php-fpm version in nginx config

[Sheratan]

In Ubuntu 22.04.02, /etc/nginx/sites-available/default still using php7.4-fpm.sock as default, but Ubuntu 22.04.02 use php 8.1

Therefore, /etc/nginx/sites-available/default should using php8.1-fpm.sock as default config

[Thomas Ward (teward)]

This may be valid for Jammy, but on its own it does *not* have enough of a priority to fix or survive on its own as an SRU. If there are other updates made, then this can be included in them, however it is trivial to edit the values yourself in the interim, so this does not meet SRU criterion alone.