Fix notebook ci geneformer scdl

[yzhang123]

Description

updated sub-packages/bionemo-geneformer/examples/geneformer-celltype-classification.ipynb which was failing in being merged PR https://github.com/NVIDIA/bionemo-framework/actions/runs/17059487337/job/48364051099
need to merge after #1030

Depends on #1030

Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactor
• Documentation update
• Other (please describe):

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[edawson]

Will review after this rebases onto main (once main has SCDL changes), but I see the fix for the failing notebook test.