Then you must have non-free enabled. Looking in /etc/apt/sources.list would quickly tell you https://www.debian.org/doc/debian-policy/ch-archive#s-non-free
If you followed the wiki when installing nvidia drivers. It would have told you to enable non-free https://wiki.debian.org/NvidiaGraphicsDrivers#Debian_12_.22Bookworm.22
Then you must have non-free enabled. Looking in /etc/apt/sources.list would quickly tell you
https://www.debian.org/doc/debian-policy/ch-archive#s-non-free
If you followed the wiki when installing nvidia drivers. It would have told you to enable non-free
https://wiki.debian.org/NvidiaGraphicsDrivers#Debian_12_.22Bookworm.22