Fix sync import error in keyspace_shard_discovery.go

[beingnoble03]

Description

This PR fixes the recent import error in keyspace_shard_discovery.go.

Related Issue(s)

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.55%. Comparing base (bbba212) to head (6a69b0f).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17972      +/-   ##
==========================================
- Coverage   67.55%   67.55%   -0.01%     
==========================================
  Files        1597     1597              
  Lines      259842   259841       -1     
==========================================
- Hits       175549   175529      -20     
- Misses      84293    84312      +19     

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[timvaillancourt]

@beingnoble03 looks like my PR #17857 introduced this, but it also seemed to pass CI. I wonder how it managed to pass CI and become mergeable 🤔. Anyways thanks!