chore(deps): update rust crate schemars to v0.8.21 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
schemars (source)	workspace.dependencies	patch	0.8.16 -> 0.8.21

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Release Notes

GREsau/schemars (schemars)

### [`v0.8.21`](https://togithub.com/GREsau/schemars/blob/HEAD/CHANGELOG.md#0821---2024-05-23) [Compare Source](https://togithub.com/GREsau/schemars/compare/v0.8.20...v0.8.21) ##### Fixed: - Fix `null` default not being set on generated schemas ([https://github.com/GREsau/schemars/issues/295](https://togithub.com/GREsau/schemars/issues/295) / [https://github.com/GREsau/schemars/pull/296](https://togithub.com/GREsau/schemars/pull/296)) ### [`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)) ### [`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)) ### [`v0.8.18`](https://togithub.com/GREsau/schemars/blob/HEAD/CHANGELOG.md#0818---2024-05-06) [Compare Source](https://togithub.com/GREsau/schemars/compare/v0.8.17...v0.8.18) ##### Fixed: - Reduce size of MIR output (and improve release-mode compile time) when deriving `JsonSchema` on enums ([https://github.com/GREsau/schemars/pull/266](https://togithub.com/GREsau/schemars/pull/266) / [https://github.com/GREsau/schemars/pull/286](https://togithub.com/GREsau/schemars/pull/286)) ### [`v0.8.17`](https://togithub.com/GREsau/schemars/blob/HEAD/CHANGELOG.md#0817---2024-04-28) [Compare Source](https://togithub.com/GREsau/schemars/compare/v0.8.16...v0.8.17) ##### Changed: - Update to syn 2.0, which should improve compile times in many cases ([https://github.com/GREsau/schemars/pull/281](https://togithub.com/GREsau/schemars/pull/281))

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