Update Rust crate syn to v2.0.85

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
syn	workspace.dependencies	patch	2.0.82 -> 2.0.85

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Release Notes

dtolnay/syn (syn)

v2.0.85

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• Preserve extern static unsafety in ForeignItem::Verbatim (#​1773)

v2.0.84

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• Parse safe and explicitly unsafe extern items (#​1768, https://github.com/rust-lang/rust/issues/123743, https://github.com/rust-lang/rfcs/pull/3484)
• Parse self captures: impl Sized + use<Self> (#​1772)

v2.0.83

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• Documentation improvements

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ruff-ecosystem results

Linter (stable)

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Linter (preview)

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Formatter (stable)

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Formatter (preview)

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