build: bump nvidia-modelopt to 0.47.0

[chadvoegele]

What does this PR do ?

Bump the pinned nvidia-modelopt override from 0.46.0rc1 to the official 0.47.0 release.

Changelog

• Update the override in pyproject.toml.
• Update only the ModelOpt override, version, and wheel URL/hash in uv.lock. No other locked packages change.
• ModelOpt’s base dependencies are unchanged from 0.46.0rc1.

GitHub Actions CI

CI is pending. Local validation passed: uv lock --check --offline with uv 0.7.2 and pre-commit run --all-files.

Before your PR is "Ready for review"

Pre checks:

• Read the Contributor guidelines.
• No new tests are needed for this dependency-only change.
• No documentation change is needed.
• No imports or optional-install guards change.
  • Reviewer: Confirm optional-library import guards remain appropriate.

Additional Information

• ModelOpt 0.47.0 release.

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[kevalmorabia97]

/ok to test 0218b90

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[balasaajay]

/ok to test 0888482