chore(deps): update rust crate uniffi to v0.31.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
uniffi (source)	build-dependencies	patch	0.31.0 → 0.31.2
uniffi (source)	dependencies	patch	0.31.0 → 0.31.2

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Release Notes

mozilla/uniffi-rs (uniffi)

v0.31.2

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What's Fixed

• Kotlin: Fixed JNA direct-mapped u8/u16 return values by widening the internal return carrier to Int, which avoids signedness mismatches during checksum validation and other direct-return paths on Android ARM32. (#​2897)
• Kotlin: Fix async functions that return an external/RustBuffer type
• Swift: Fixed FfiConverterString silently stripping a leading U+FEFF byte order mark from Rust strings.
• Swift: Prevent strict concurrency warning with callback interface tables

All changes in v0.31.2.

v0.31.1

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What's Fixed

• Swift: Fixed iOS crash when address sanitizer is enabled
  #​2821
• Swift: Fixed memory link in async code
  #​2854

All changes in v0.31.1.

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