chore(deps): update rust crate syn to v2.0.111

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
syn	dependencies	patch	2.0.108 -> 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

Compare Source

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

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