build(deps): Bump syn from 2.0.72 to 2.0.74

[dependabot[bot]]

Bumps syn from 2.0.72 to 2.0.74.

Release notes

Sourced from syn's releases.

2.0.74

• Fix "temporary is dropped and runs the destructor for type `impl Iterator`" regression affecting certain use of Generics iterator methods (#1719)

2.0.73

• Support parsing unnamed C varargs within function pointer types (#1711)
• Improve synthesized error message on unexpected tokens at the end of the expected contents of a delimited group (#1713)
• Support parsing unstable tail call syntax (#1714, rust-lang/rust#112788)
• Add Fields::members iterator (#1716, thanks @​Fancyflame)

Commits

• b15ae28 Release 2.0.74
• 6cf2344 Merge pull request #1719 from dtolnay/iterators
• 2955ac5 Expose non-impl-Trait iterator return types
• 7dc05a5 Add regression test for issue 1718
• 857942e Revert "Define Fields::members iterator type privately inside method"
• 65ec30d Revert "Embed Generics iterator implementations into method bodies"
• b5a5a8c Release 2.0.73
• 8cdb5c7 Add example of using Fields::members iterator
• 2afdc12 Remove redundancy of Generics::split_for_impl cfg with type's cfg
• 64b0dc8 Combine Generics impl blocks into one
• Additional commits viewable in compare view

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