CI: Fix gem_name for ipynbdiff gem
What does this MR do and why?
Follow-up of !124283 (merged).
Fixes CI failures like https://gitlab.com/gitlab-org/gitlab/-/pipelines/924355751.
| https://gitlab.com/gitlab-org/gitlab/-/pipelines/924388457 |
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MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Peter Leitzen