Update Rust crate syn to v2.0.74

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
syn	workspace.dependencies	patch	2.0.72 -> 2.0.74

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Release Notes

dtolnay/syn (syn)

v2.0.74

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• Fix "temporary is dropped and runs the destructor for type `impl Iterator`" regression affecting certain use of Generics iterator methods (#​1719)

v2.0.73

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• Support parsing unnamed C varargs within function pointer types (#​1711)
• Improve synthesized error message on unexpected tokens at the end of the expected contents of a delimited group (#​1713)
• Support parsing unstable tail call syntax (#​1714, https://github.com/rust-lang/rust/issues/112788)
• Add Fields::members iterator (#​1716, thanks @​Fancyflame)

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