

TITLE
Bump notebook from 6.1.5 to 6.4.1 in /examples/research_projects/lxmert

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Bumps [notebook](http://jupyter.org) from 6.1.5 to 6.4.1.


[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=notebook&package-manager=pip&previous-version=6.1.5&new-version=6.4.1)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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