[AIR] Remove Checkpoint._object_ref
#31777
Merged
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Depends on:
Why are these changes needed?
#31763 removes
Checkpoint.from_object_ref
, but doesn't remove the now-unusedCheckpoint._object_ref
. This PR cleans up the dead code.Related issue number
Checks
git commit -s
) in this PR.scripts/format.sh
to lint the changes in this PR.