CUDA: fix sum.cu compilation for CUDA < 11.7 #9562
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Fixes #9554 .
I assume the problem comes from the use of CUB so a possible fix is to use the sumrows workaround for old CUDA versions. The compilation fails for 11.5 and succeeds for 11.7 so the cutoff needs to be either 11.6 or 11.7. Unfortunately the CUB documentation seems to be linked incorrectly so I can't access the CUB documentation for 11.6, I've decided to just go with 11.7.