Update dependency nbformat to v5.10.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
nbformat (changelog)	==5.10.2 -> ==5.10.3

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Release Notes

jupyter/nbformat (nbformat)

### [`v5.10.3`](https://togithub.com/jupyter/nbformat/blob/HEAD/CHANGELOG.md#5103) [Compare Source](https://togithub.com/jupyter/nbformat/compare/v5.10.2...v5.10.3) ([Full Changelog](https://togithub.com/jupyter/nbformat/compare/v5.10.2...c17a251a1b1c5e2a7b9fe1fce866d4c110dd12eb)) ##### Bugs fixed - Revert PR [#​378](https://togithub.com/jupyter/nbformat/issues/378) (Simplify NotebookNotary.\_data_dir_default) [#​397](https://togithub.com/jupyter/nbformat/pull/397) ([@​krassowski](https://togithub.com/krassowski)) ##### Contributors to this release ([GitHub contributors page for this release](https://togithub.com/jupyter/nbformat/graphs/contributors?from=2024-03-12\&to=2024-03-15\&type=c)) [@​krassowski](https://togithub.com/search?q=repo%3Ajupyter%2Fnbformat+involves%3Akrassowski+updated%3A2024-03-12..2024-03-15\&type=Issues)

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