Update Rust crate schemars to 0.8.15

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
schemars (source)	dependencies	patch	0.8.13 -> 0.8.15

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Release Notes

GREsau/schemars (schemars)

v0.8.15

Compare Source

Added:

• Implement JsonSchema for BigDecimal from bigdecimal 0.4 (https://github.com/GREsau/schemars/pull/237)

v0.8.14

Compare Source

Added:

• Add #[schemars(inner(...)] attribute to specify schema for array items (https://github.com/GREsau/schemars/pull/234)

Changed:

• New optional associated function on JsonSchema trait: schema_id(), which is similar to schema_name(), but does not have to be human-readable, and defaults to the type name including module path. This allows schemars to differentiate between types with the same name in different modules/crates (https://github.com/GREsau/schemars/issues/62 / https://github.com/GREsau/schemars/pull/247)

Fixed:

• Schemas for rust_decimal::Decimal and bigdecimal::BigDecimal now match how those types are serialized by default, i.e. as numeric strings (https://github.com/GREsau/schemars/pull/248)

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