chore: Bump syn from 2.0.58 to 2.0.65

[dependabot[bot]]

Bumps syn from 2.0.58 to 2.0.65.

Release notes

Sourced from syn's releases.

2.0.65

• Optimize the implementation of Fold to compile faster (#1666, #1667, #1668)

2.0.64

• Support using ParseBuffer across catch_unwind (#1646)
• Validate that the expression in a let-else ends in brace as required by rustc (#1648, #1649)
• Legalize invalid const generic arguments by wrapping in braces (#1654, #1655)
• Fix some expression precedence edge cases involving break and return in loop headers (#1656)
• Always print closure bodies with a brace when the closure has an explicit return type (#1658)
• Automatically insert necessary parentheses in ToTokens for Expr when required by expression precedence (#1659)
• Support struct literal syntax in match guard expressions (#1662)

2.0.63

• Parse and print long if-else-if chains without reliance on deep recursion to avoid overflowing stack (#1644, #1645)

2.0.62

• Reject invalid unparenthesized range and comparison operator expressions (#1642, #1643)

2.0.61

• Check for legal binding name in the ident of Pat::Ident (#1627)
• Resolve unexpected_cfgs warning (#1635)

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

• 9f2371e Release 2.0.65
• 4cd1813 Merge pull request #1668 from dtolnay/foldhelper
• ed54092 Eliminate gen::helper module
• eacc8ab Eliminate FoldHelper trait
• 6e20bb8 Merge pull request #1667 from dtolnay/punctuatedfold
• 9d95cab Optimize punctuated::fold
• 82ffe86 Move Punctuated fold helper to punctuated module
• 3dfacc1 Ignore manual_map clippy lint
• 7273aa7 Merge pull request #1666 from dtolnay/foldhelper
• 8124c0e Generate fewer monomorphizations in Fold
• Additional commits viewable in compare view

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