[GraphBolt][CUDA] GPUCachedFeature update fix.

[mfbalin]

Description

Fixes #7377. I realized there was an issue with the modified PyG advanced example. I will use the cache version in the DGL 2.2 release blog so I would like to merge the example change too.

Checklist

Please feel free to remove inapplicable items for your PR.

• The PR title starts with [$CATEGORY] (such as [NN], [Model], [Doc], [Feature]])
• I've leverage the tools to beautify the python and c++ code.
• The PR is complete and small, read the Google eng practice (CL equals to PR) to understand more about small PR. In DGL, we consider PRs with less than 200 lines of core code change are small (example, test and documentation could be exempted).
• All changes have test coverage
• Code is well-documented
• To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
• Related issue is referred in this PR
• If the PR is for a new model/paper, I've updated the example index here.

Changes

[dgl-bot]

To trigger regression tests:

• @dgl-bot run [instance-type] [which tests] [compare-with-branch];
  For example: @dgl-bot run g4dn.4xlarge all dmlc/master or @dgl-bot run c5.9xlarge kernel,api dmlc/master

[dgl-bot]

Commit ID: 6e46c56

Build ID: 1

Status: ❌ CI test failed in Stage [Torch GPU Unit test].

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Commit ID: dab096a

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Commit ID: b908775

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Commit ID: 8b0b708859842e1c2c5334f03c352ebe97bfb2cd

Build ID: 8

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Commit ID: e47f20f

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[dgl-bot]

Commit ID: 66a954d

Build ID: 11

Status: ❌ CI test failed in Stage [Lint Check].

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Commit ID: d2e41f8

Build ID: 12

Status: ✅ CI test succeeded.

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