chore: update rust crate syn to v2.0.111

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
syn	workspace.dependencies	patch	2.0.104 -> 2.0.111

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Release Notes

dtolnay/syn (syn)

v2.0.111

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• Allow first argument of braced!, bracketed!, parenthesized! to be an otherwise unused variable (#​1946)

v2.0.110

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• Tweaks to improve build speed (#​1939, thanks @​dishmaker)
• Make syn::ext::IdentExt::unraw available without "parsing" feature (#​1940)
• Support parsing syn::Meta followed by => (#​1944)

v2.0.109

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• Tweaks to improve build speed (#​1927, #​1928, #​1930, #​1932, #​1934, thanks @​dishmaker)

v2.0.108

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• Parse unrecognized or invalid literals as Lit::Verbatim (#​1925)

v2.0.107

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• Improve panic message when constructing a LitInt, LitFloat, or Lit from invalid syntax (#​1917)
• Improve panic message on Punctuated index out of bounds (#​1922)

v2.0.106

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• Replace ~const syntax with [const] conditionally const syntax in trait bounds (#​1896, rust-lang/rust#139858)
• Support conditionally const impl Trait types (#​1897)
• Reject polarity modifier and lifetime binder used in the same trait bound (#​1899, rust-lang/rust#127054)
• Parse const trait bounds with bound lifetimes (#​1902)
• Parse bound lifetimes with lifetime bounds (#​1903)
• Allow type parameters and const parameters in trait bounds and generic closures (#​1904, #​1907, #​1908, #​1909)

v2.0.105

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• Disallow "negative" inherent impls like impl !T {} (#​1881, rust-lang/rust#144386)

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