build(deps): Update Rust crate syn to 2.0.60

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
syn	dependencies	patch	2.0 -> 2.0.60

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Release Notes

dtolnay/syn (syn)

v2.0.60

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• Improve how None-delimited groups are counted by peek (#​1625)

v2.0.59

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• Parse c"…" and cr"…" C-string literal syntax as Lit::CStr (#​1502)

v2.0.58

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• Support $ in custom_punctuation! macro (#​1611)

v2.0.57

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• Eliminate dependency on quote when built with default-features disabled and the "proc-macro" feature enabled (#​1608, thanks @​BD103)

v2.0.56

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• Apply RUSTC_WORKSPACE_WRAPPER when deciding whether to run nightly-only tests (#​1605)

v2.0.55

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• Restore compatibility with rustc 1.56 through 1.59 (#​1603)

v2.0.54

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• Fix dead code warning in generated code when using custom_keyword! with syn's "printing" feature disabled (#​1602)

v2.0.53

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• Implement Copy, Clone, and ToTokens for syn::parse::Nothing (#​1597)

v2.0.52

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• Add an expression parser that uses match-arm's boundary rules (#​1593)

v2.0.51

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• Resolve non_local_definitions warnings in generated code under rustc 1.78-nightly

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