build(deps): bump syn from 2.0.18 to 2.0.29 in /protocol

[dependabot]

Bumps syn from 2.0.18 to 2.0.29.

Release notes

Sourced from syn's releases.

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)

Commits

• b387b13 Release 2.0.29
• 1faea07 Partially work around ridiculous rust-analyzer behavior
• 24d6ef4 Merge pull request #1494 from dtolnay/primitive
• 47dc5d0 Switch to using primitives in macro-generated code through std::primitive
• 020fe20 Update test suite to nightly-2023-08-05
• f561339 Update test suite to nightly-2023-08-04
• 44c5fdd Release 2.0.28
• 65aa662 Merge pull request #1491 from dtolnay/expectedexpr
• 91c84f6 Fix trivial difference between full and non-full expression parse errors
• f79ba15 Update test suite to nightly-2023-07-29
• Additional commits viewable in compare view

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[dependabot]

Superseded by #67.