Bump torch cuda version to 11.8

[shreyasvinaya]

bumping up version as docker doesn't have a 11.7 version

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[GreatRSingh]

@shreyasvinaya why aren't we bumping it up till 12

[shreyasvinaya]

@GreatRSingh cuda version 12 brings in a lot of changes and a lot of systems are yet to be migrated to it. So it will be better to use cuda 11.8 and put up a notice that we will be moving to cuda 12 in the near future and in the future put up a default 12.1 cuda version and maybe a 11.8 compatibility version

[rbharath]

LGTM