⬆️ bump nvidia-nvtx-cu12 from 12.1.105 to 12.6.68

Bumps [nvidia-nvtx-cu12](https://developer.nvidia.com/cuda-zone) from 12.1.105 to 12.6.68.

---
updated-dependencies:
- dependency-name: nvidia-nvtx-cu12
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]