Update Rust crate schemars to 0.8.12

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
schemars (source)	dependencies	patch	0.8.10 -> 0.8.12

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Release Notes

GREsau/schemars

### [`v0.8.12`](https://togithub.com/GREsau/schemars/blob/HEAD/CHANGELOG.md#​0812---2023-02-26) [Compare Source](https://togithub.com/GREsau/schemars/compare/v0.8.11...v0.8.12) ##### Added: - Implement `JsonSchema` for `smol_str::SmolStr` ([https://github.com/GREsau/schemars/pull/72](https://togithub.com/GREsau/schemars/pull/72)) ##### Changed: - Change `serde_json` dependency min version to 1.0.25 (was 1.0.0) ([https://github.com/GREsau/schemars/pull/192](https://togithub.com/GREsau/schemars/pull/192)) ### [`v0.8.11`](https://togithub.com/GREsau/schemars/blob/HEAD/CHANGELOG.md#​0811---2022-10-02) [Compare Source](https://togithub.com/GREsau/schemars/compare/v0.8.10...v0.8.11) ##### Added: - Replace auto-inferred trait bounds with bounds specified in `#[schemars(bound = "...")]` attribute ##### Changed: - Derived `JsonSchema` now respects attributes on unit enum variants ([https://github.com/GREsau/schemars/pull/152](https://togithub.com/GREsau/schemars/pull/152)) - Minimum supported rust version is now 1.45.0

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