fix(deps): update rust crate syn to 2.0.39

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
syn	dependencies	patch	2.0.15 -> 2.0.39
syn	dependencies	patch	2.0.18 -> 2.0.39

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Release Notes

dtolnay/syn (syn)

v2.0.39

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• Fix parsing of return expression in match guards (#​1528)
• Improve error message on labeled loop as value expression for break (#​1531)

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)

v2.0.29

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• Partially work around rust-analyzer bug (https://github.com/rust-lang/rust-analyzer/issues/9911)

v2.0.28

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• Fix inconsistency between full and non-full expression parse errors (#​1491)

v2.0.27

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• Documentation improvements (thanks @​GuillaumeGomez)

v2.0.26

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• Implement Spanned for QSelf (#​1465)

v2.0.25

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• Support single identifier as unbraced const generic argument (#​1483)
• Produce error message when LitStr::parse is used on a suffixed string literal (#​1484)

v2.0.24

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• Fix duplication of braces around const generic argument in non-full mode (#​1482)

v2.0.23

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• Preserve attributes on verbatim Item in statement position (#​1476)
• Support generic_const_exprs where-clauses such as where [(); { T::COUNT }]: in non-"full" mode (#​1478)

v2.0.22

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• Parse c"…" c-string literals (tracking issue: https://github.com/rust-lang/rust/issues/105723)

v2.0.21

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• Fix value computed by LitByteStr::value in the case of a cooked byte string literal containing form feed or vertical tab characters following an escaped newline (#​1474)

v2.0.20

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• Documentation improvements

v2.0.19

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• Improve rendering of compile errors within 2015-edition code calling a 2018+ edition proc macro (#​1467, thanks @​danielhenrymantilla)

v2.0.18

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• Permit empty attr in syn::meta::parser (#​1460)

v2.0.17

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• Enable proc_macro support on wasm targets (#​1459)

v2.0.16

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• Parse builtin # syntax as Expr::Verbatim (https://github.com/rust-lang/rust/issues/110680, #​1454)

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