cloudxr: bump CXR_RUNTIME_SDK_VERSION to 6.3.0-rc8

[jiwenc-nv]

Description

Bumps the CloudXR Runtime SDK pin in deps/cloudxr/.env.default from 6.3.0-rc4 to 6.3.0-rc8, so scripts/download_cloudxr_runtime_sdk.sh and the runtime container pick up the newer release candidate. CXR_WEB_SDK_VERSION is deliberately left at 6.3.0-rc4 — only the runtime tarball moves.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Testing

Downloaded and ran the rc8 runtime SDK locally on aarch64.

Checklist

• I have read and understood the contribution guidelines
• I have run the linter and formatter with SKIP=check-copyright-year pre-commit run --all-files
• I have made corresponding changes to the documentation
• I have added tests that prove my fix/feature works (or explained why not)
• I have signed off all my commits (git commit -s) per the DCO

Summary by CodeRabbit

• Chores
  • Updated the CloudXR runtime SDK to version 6.3.0-rc8.

[github-actions]

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[coderabbitai]

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 8278e3f and e772665.

📒 Files selected for processing (1)

• deps/cloudxr/.env.default

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📝 Walkthrough

Walkthrough

The default CloudXR runtime SDK version changes from 6.3.0-rc4 to 6.3.0-rc8 in deps/cloudxr/.env.default.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to e7726

This is a localized runtime SDK version update with no actionable merge-blocking risk remaining after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the version update in deps/cloudxr/.env.default.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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