I have no added any patch. The problem is the kernel is build with gcc-14 and the midule-sorce was not compatible with gcc-14. Nvidia upstream has fixed that in the new versions of the driver.
You can try the following:
put
make CC=/bin/gcc-13 IGNORE_CC_MISMATCH=1 ...
in your dkms.conf. But that only works, if your nvidia version is generaly compatible with kernel 6.8.
Besides of that, we do not support packages, installed from 3rd party repos.
You even can wait for the next kernel-update, which use gcc-13 for compiling.