Bump syn from 2.0.60 to 2.0.63

[dependabot[bot]]

Bumps syn from 2.0.60 to 2.0.63.

Release notes

Sourced from syn's releases.

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)

Commits

• 8bcd277 Release 2.0.63
• 6d1113d Merge pull request #1645 from dtolnay/ifelse
• 40950dd Remove recursion from printing of Expr::If
• e2e7f2d Merge pull request #1644 from dtolnay/ifelse
• 70777ce Remove recursion from parsing of Expr::If
• e9e6329 Release 2.0.62
• c79cea1 Merge pull request #1643 from dtolnay/chainedcompare
• dc4ffde Require parens for chained comparison binops
• c463a74 Add tests of binop associativity
• da509d5 Add test of assignment and range precedence
• Additional commits viewable in compare view

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