build(deps): Update Rust crate syn to v2.0.71

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
syn	dependencies	patch	2.0.70 -> 2.0.71

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Release Notes

dtolnay/syn (syn)

### [`v2.0.71`](https://togithub.com/dtolnay/syn/releases/tag/2.0.71) [Compare Source](https://togithub.com/dtolnay/syn/compare/2.0.70...2.0.71) - Do not require mutable borrow in Punctuated::get() ([#​1706](https://togithub.com/dtolnay/syn/issues/1706), thanks [@​lemunozm](https://togithub.com/lemunozm))

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