Update cuda version in wrapper Dockerfile.GPU

[ashrafgt]

What this PR does / why we need it:
Updates CUDA version from 10.0 to 10.2 and CudNN from 7 to 8 in s2i wrapper GPU Dockerfile, with the goal of supporting inference with onnxruntime-gpu==1.6.0 with torch==1.6.0 right out of the box

Update CUDA version from 10.0 to 10.2 and CudNN from 7 to 8 in s2i wrapper GPU Dockerfile.

[seldondev]

Hi @ashrafgt. Thanks for your PR.

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[ukclivecox]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cliveseldon

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[axsaucedo]

/ok-to-test