fix: use correct var names for check_tokenizers script
Author: niqodea
Pull request: yes

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Fixes #33661

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Comments:
@LysandreJik I force-pushed a different commit with identical changes to retrigger the CI since the error seemed flaky. Tests now pass, so it seems like that was the case.

Anyways, I am lacking the permission to merge as of now, due to a workflow awaiting approval. Is merging up to me or someone else?

It's up to me :hugs: Thanks for your contribution!