fix(deps): update rust crate schemars to v0.8.19

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
schemars (source)	dependencies	patch	0.8.18 -> 0.8.19

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Release Notes

GREsau/schemars (schemars)

### [`v0.8.19`](https://togithub.com/GREsau/schemars/blob/HEAD/CHANGELOG.md#0819---2024-05-06) [Compare Source](https://togithub.com/GREsau/schemars/compare/v0.8.18...v0.8.19) ##### Fixed: - Regression that caused a compile error when deriving `JsonSchema` on an enum with no variants ([https://github.com/GREsau/schemars/issues/287](https://togithub.com/GREsau/schemars/issues/287))

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