fix(deps): update rust crate syn to 2.0.38

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
syn	dependencies	patch	2.0.29 -> 2.0.38

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Release Notes

dtolnay/syn (syn)

v2.0.38

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• Fix "method 'peek' has an incompatible type for trait" error when defining bool as a custom keyword (#​1518, thanks @​Vanille-N)

v2.0.37

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• Work around incorrect future compatibility warning in rustc 1.74.0-nightly

v2.0.36

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• Restore compatibility with --generate-link-to-definition documentation builds (#​1514)

v2.0.35

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• Make rust-analyzer produce preferred brackets for invocations of Token! macro (#​1510, #​1512)

v2.0.34

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• Documentation improvements

v2.0.33

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• Special handling for the (/*ERROR*/) placeholder that rustc uses for macros that fail to expand

v2.0.32

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• Add Path::require_ident accessor (#​1496, thanks @​Fancyflame)

v2.0.31

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• Parse generics and where-clause on const items (https://github.com/rust-lang/rust/issues/113521)

v2.0.30

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• Parse unnamed struct/union type syntax (https://github.com/rust-lang/rust/issues/49804)

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