feat: Upgrade velox submodule to y-scope/velox@6fabc5.

[20001020ycx]

Description

This PR is to update the Velox submodule to sync the merged PRs y-scope/velox#48 to have the support of custom S3 object storage.

Checklist

• The PR satisfies the contribution guidelines.
• This is a breaking change and that has been indicated in the PR title, OR this isn't a
  breaking change.
• Necessary docs have been updated, OR no docs need to be updated.

Validation performed

Summary by CodeRabbit

• Chores
  • Updated internal dependency version with no functional or behavioural changes to the application.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📝 Walkthrough

Walkthrough

The pull request updates the Velox submodule pointer in the presto-native-execution directory from commit 52bb2fedafd6b7ceb12bb60ef959d2a290e82f17 to commit 6fabc5e70d039ef3b5f7591f9f787480a9c3136e with no functional or behavioral modifications.

Changes

Cohort / File(s)	Summary
Submodule pointer presto-native-execution/velox	Updated Velox submodule reference to a newer commit (52bb2fe → 6fabc5e).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• feat: Upgrade velox submodule to y-scope/velox@7c55762. #59: Updates the same Velox submodule pointer in presto-native-execution/velox path.
• feat: Upgrade velox submodule to y-scope/velox@52bb2f  #85: Modifies the Velox submodule pointer, with this PR advancing it further to 6fabc5e.

Suggested reviewers

• kirkrodrigues
• wraymo

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description provides the motivation (custom S3 object storage support) and references the related PR, but does not follow the repository's required template structure with sections like Motivation and Context, Impact, and Test Plan.	Restructure the description to follow the template with sections for Description, Motivation and Context, Impact, Test Plan, and complete the Release Notes section with either specific notes or 'NO RELEASE NOTE'.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: upgrading the velox submodule to a specific commit hash with conventional commits format.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch 2026-02-19-update-velox

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