build(deps): bump syn from 2.0.58 to 2.0.60

[dependabot[bot]]

Bumps syn from 2.0.58 to 2.0.60.

Release notes

Sourced from syn's releases.

2.0.60

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

2.0.59

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

Commits

• 7029b22 Release 2.0.60
• e978b98 Remove html_root_url & syn.json reminder from Cargo.toml
• 48f99b0 Merge pull request #1625 from dtolnay/peek
• 4b18c15 Improve how None-delimited groups are counted by peek
• 9f00b23 Merge pull request #1624 from dtolnay/peektest
• 990300a Add more extensive tests for ParseStream::peek
• 1431bd6 Update None-delimited group notation to use «∅ ∅»
• 54a1643 Fix empty-set symbol in comments
• 7307d29 Merge pull request #1623 from dtolnay/arrays
• 68d1cd9 Take advantage of the IntoIterator for [T; N]
• Additional commits viewable in compare view

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