Update Rust crate syn to v2.0.71

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
syn	workspace.dependencies	patch	2.0.68 -> 2.0.71

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Release Notes

dtolnay/syn (syn)

v2.0.71

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• Do not require mutable borrow in Punctuated::get() (#​1706, thanks @​lemunozm)

v2.0.70

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• Improve parenthesization of closures, jumps, ranges, chained comparisons, and let (#​1694, #​1695, #​1698, #​1699, #​1700)

v2.0.69

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• Correctly parenthesize labeled loops inside a break value (#​1692)
• Add Punctuated::get and get_mut (#​1693)

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