Bump syn from 2.0.82 to 2.0.85 in /autorust

[dependabot[bot]]

Bumps syn from 2.0.82 to 2.0.85.

Release notes

Sourced from syn's releases.

2.0.85

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

2.0.84

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

2.0.83

• Documentation improvements

Commits

• 293d7c9 Release 2.0.85
• c94df74 Merge pull request #1773 from dtolnay/unsafestatic
• 8d7814a Preserve extern static unsafety in ForeignItem::Verbatim
• 2e159bc Release 2.0.84
• 058e7d0 Merge pull request #1772 from dtolnay/selfcapture
• 2a9e9fb Parse self captures: impl Sized + use\<Self>
• e478e03 Merge pull request #1771 from dtolnay/up
• 19baaa6 Categorize newly failing rust repo source files
• f89eca2 Update test suite to nightly-2024-10-23
• 83e3b08 Merge pull request #1768 from dtolnay/safe
• Additional commits viewable in compare view

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