Add libcurand-dev to CUDA Docker image for cuda-windows CI

[Gasoonjia]

Commit c1731fd added CUDA::curand as a CMake dependency in backends/cuda/CMakeLists.txt for the new GPU-side sampling shim (rand.cu). However, the CI Docker image (install_cuda.sh) did not include libcurand-dev, so the CMake build during pip install fails when EXECUTORCH_BUILD_CUDA=ON is auto-detected. This causes executorch to not be installed at all, breaking the dinov2 export (No module named 'executorch') and parakeet export (No module named 'torchaudio', since torchaudio installation is skipped when the prior pip install step fails) in the cuda-windows CI workflow.

[pytorch-bot]

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❌ 2 New Failures, 5 Cancelled Jobs, 1 Pending

As of commit 732058b with merge base 831b7d4 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-arm-backend-with-no-deps (test_pytest_ops_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t d7fc22563900a64c2d98fe0b651d90a6f5015fdff3586c6cb72cb9aa2a205ac0 /exec failed with exit code 1
• pull / unittest-buck / macos / macos-job (gh)
  An error occurred trying to start process '/bin/bash' with working directory '/Users/ec2-user/runner/_work/executorch/executorch'. No such file or directory

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / test-lora-linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-qnn-passes-linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / unittest / linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / unittest-editable / linux / linux-job (gh)
  ##[error]The operation was canceled.

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