build(deps): bump syn from 1.0.109 to 2.0.31

[dependabot[bot]]

Bumps syn from 1.0.109 to 2.0.31.

Release notes

Sourced from syn's releases.

2.0.31

• Parse generics and where-clause on const items (rust-lang/rust#113521)

2.0.30

• Parse unnamed struct/union type syntax (rust-lang/rust#49804)

2.0.29

• Partially work around rust-analyzer bug (rust-lang/rust-analyzer#9911)

2.0.28

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

2.0.27

• Documentation improvements (thanks @​GuillaumeGomez)

2.0.26

• Implement Spanned for QSelf (#1465)

2.0.25

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

2.0.24

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

2.0.23

• 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)

2.0.22

• Parse c"…" c-string literals (tracking issue: rust-lang/rust#105723)

2.0.21

• 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)

2.0.20

• Documentation improvements

2.0.19

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

2.0.18

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

2.0.17

• Enable proc_macro support on wasm targets (#1459)

2.0.16

• Parse builtin # syntax as Expr::Verbatim (rust-lang/rust#110680, #1454)

... (truncated)

Commits

• b20e2c8 Release 2.0.31
• 0cfdca7 Merge pull request #1503 from dtolnay/constverbatim
• 8cdfd09 Parse const item with generics as Verbatim
• b80156e Adjust implementation of where-clause parsing on const items
• d73386e Parse where-clause on const item without value expr
• 3805187 Update CStr literal link
• 5751455 Link to issue for tail call syntax
• 5ede892 Merge pull request #1500 from dtolnay/dupexclude
• f3727bf Detect duplication between excluded files and dirs
• ecfbe2e Detect duplicate entries in exclusion lists
• Additional commits viewable in compare view

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