[GraphBolt] Remove workaround for `DILL_AVAILABLE` in torch 2.3.0

[Rhett-Ying]

🔨Work Item

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Project tracker: https://github.com/orgs/dmlc/projects/2

Description

Depending work items or issues

[Rhett-Ying]

see https://github.com/dmlc/dgl/pull/7383#

[mfbalin]

https://github.com/pytorch/pytorch/issues/125425#issuecomment-2108698508

Looks like the fix will be available in 2.3.1.

[mfbalin]

https://github.com/pytorch/pytorch/issues/124907#issuecomment-2108790596

[Rhett-Ying]

back-compatible is available since torch 2.3.1. we should make change on current workaround in DGL: https://github.com/dmlc/dgl/blob/7c3d418e88fe0a20f56971ec4ca54cd026bdfe0d/python/dgl/graphbolt/base.py#L9-L16

[mfbalin]

Fixed by #7474.