E: Failed to fetch https://packages.sury.org/php/dists/bullseye/InRelease 451 [IP: ...]

комментируем в /etc/apt/sources.list.d/php8.list

#deb https://packages.sury.org/php/ bullseye main

и добавляем deb https://ftp.mpi-inf.mpg.de/mirrors/linux/mirror/deb.sury.org/repositories/php/ bullseye main