Update Rust crate schemars to v0.8.21 - autoclosed

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
schemars (source)	dependencies	patch	0.8.17 -> 0.8.21

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Release Notes

GREsau/schemars (schemars)

v0.8.21

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Fixed:

• Fix null default not being set on generated schemas (https://github.com/GREsau/schemars/issues/295 / https://github.com/GREsau/schemars/pull/296)

v0.8.20

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Fixed:

• Revert unintentional change in behaviour when combining default and required attributes (https://github.com/GREsau/schemars/issues/292)

v0.8.19

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Fixed:

• Regression that caused a compile error when deriving JsonSchema on an enum with no variants (https://github.com/GREsau/schemars/issues/287)

v0.8.18

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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://github.com/GREsau/schemars/pull/286)

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