feat: Upgrade velox submodule to y-scope/velox@9b46.

[20001020ycx]

Description

This PR is to update the Velox submodule to sync the merged PR yscope/velox#44

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

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