build(deps): bump syn from 2.0.66 to 2.0.67

[dependabot[bot]]

Bumps syn from 2.0.66 to 2.0.67.

Release notes

Sourced from syn's releases.

2.0.67

• Produce more accurate error message locations for errors located at the end of a nested group (#1679, #1680)
• Support peeking LitCStr in ParseStream::peek (#1682)

Commits

• 25f6299 Release 2.0.67
• 666e15e Revert "List peekable token types in documentation of Peek trait"
• 2955706 Merge pull request #1683 from dtolnay/peekimpl
• 0c90291 List peekable token types in documentation of Peek trait
• 26ce3d9 Merge pull request #1682 from dtolnay/peekcstr
• ec0c84b Make LitCStr peekable
• 8cb56cc Update test suite to nightly-2024-06-20
• 7cc7eac Inline lookahead::is_delimiter into delimiter Token impls
• 8a2a86b Merge pull request #1681 from dtolnay/offset
• e86538c Optimize reverse iteration of TokenBuffer
• Additional commits viewable in compare view

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