Bump notebook in /examples/research_projects/visual_bert (#15368)
Bumps [notebook](http://jupyter.org) from 6.1.5 to 6.4.1.
---
updated-dependencies:
- dependency-name: notebook
dependency-type: direct:production
...
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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Lysandre Debut <lysandre@huggingface.co>