Nobara by default includes the Nvidia modules in the initramfs to prevent no video issues during LUKS password entry. This ends up taking a lot of space on the /boot partition, especially so if it's coupled with an AMD iGPU.
If you don't use LUKS and want to free up space for more kernels and/or your 1GB (default size) /boot partition is full and you can no longer update the kernel you have 2 options.
echo 'omit_drivers+=" nvidia nvidia-drm nvidia-modeset nvidia-peermem nvidia-uvm "' | sudo tee /usr/lib/dracut/dracut.conf.d/99-nvidia.conf
sudo dracut -f --regenerate-all
For this method, you can follow this guide Nobara Kernel Fallback