chore: upgrade vLLM to 0.18.0 and torch/unsloth to equivalent versions

[mckornfield]

• Upgrade various versions to address CVEs
• Remove deprecated parameters

[Copilot]

Pull request overview

This PR upgrades the vLLM/Torch/Unsloth dependency stack to newer versions to address CVEs and adjusts the vLLM backend implementation/tests to align with removed/deprecated vLLM parameters and behaviors.

Changes:

• Upgraded vLLM to 0.18.0 and updated Torch/TorchVision/TorchAO/Unsloth/XFormers pins accordingly.
• Removed per-request logits processor usage from the vLLM backend (including removing the TypicalLogitsWarper wrapper) and updated unit tests to reflect that typical_p is excluded.
• Increased an end-to-end test timeout to accommodate longer runtimes with the upgraded stack.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

File	Description
tests/generation/test_vllm_backend.py	Updates mapping/unit tests to assert typical_p is excluded instead of creating a logits processor.
tests/e2e/test_safe_synthesizer.py	Extends e2e timeout to reduce flakiness under slower runs.
src/nemo_safe_synthesizer/generation/vllm_backend.py	Removes deprecated/unsupported vLLM request-time logits processing and deprecated structured-output args.
pyproject.toml	Bumps dependency pins for torch/torchvision/torchao/unsloth/vllm/xformers.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

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[kendrickb-nvidia]

/sync

[Copilot]

Pull request overview

Copilot reviewed 3 out of 4 changed files in this pull request and generated no new comments.

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[nina-xu]

i think this could work as is. approving pending a full slurm sweep

[Copilot]

Pull request overview

Copilot reviewed 3 out of 4 changed files in this pull request and generated no new comments.

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