[Dependencies] Upgrade CUDA Toolkit to version 12.6.3 (from 12.4.1).

[gmarciani]

Description of changes

Upgrade CUDA Toolkit to version 12.6.3 (from 12.4.1).

Tests

ONGOING

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[gmarciani]

Cannot execute the update because of lack of compatibility.
Driver 550.127.08 only support CUDA version up to 12.4.1
See https://docs.nvidia.com/cuda/cuda-toolkit-release-notes/index.html#id5.

We will reopen this when we will upgrade the drivers.