[cmake] sm 86 is only for cuda >= 11.1

[simogasp]

SM86 is available only from 11.1 inwards (https://arnon.dk/matching-sm-architectures-arch-and-gencode-for-various-nvidia-cards/)

On cuda 11.0 that arch is not recognized and it generates an error.

[griwodz]

I didn't find a confirmation for this restriction on NVidia's pages anywhere, but if sm_86 doesn't work for SDK 11, it's obviously true. :-)

[griwodz]

Independently confirmed after all:
https://gitlab.kitware.com/cmake/cmake/-/blob/4f6fccd86174742c2f17aeba1a940be383a3c7df/Modules/FindCUDA/select_compute_arch.cmake