remove unused imports

[yihau]

Problem

Summary of Changes

remove the unused imports.

[CriesofCarrots]

Any idea why CI didn't catch this on the PR?
#34359
cc @taozhu-chicago

[yihau]

it passed check. I'm going to merge it on red!

@CriesofCarrots I'm guessing Tao's branch doesn't really rebase the latest master 🤔 he had some changes in the same file these days.

(maybe a before merge test can save us here. iirc the merge queue can do it!)

[tao-stones]

it passed check. I'm going to merge it on red!

@CriesofCarrots I'm guessing Tao's branch doesn't really rebase the latest master 🤔 he had some changes in the same file these days.

(maybe a before merge test can save us here. iirc the merge queue can do it!)

I think I rebased master before commit, but I could be wrong. Maybe the PR waited long enough time between CI green and approval/merge?