fix(deps): update rust crate schemars to v0.8.20

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
schemars (source)	dependencies	patch	0.8.19 -> 0.8.20

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Release Notes

GREsau/schemars (schemars)

### [`v0.8.20`](https://togithub.com/GREsau/schemars/blob/HEAD/CHANGELOG.md#0820---2024-05-18) [Compare Source](https://togithub.com/GREsau/schemars/compare/v0.8.19...v0.8.20) ##### Fixed: - Revert unintentional change in behaviour when combining `default` and `required` attributes ([https://github.com/GREsau/schemars/issues/292](https://togithub.com/GREsau/schemars/issues/292))

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