Bump syn from 2.0.69 to 2.0.71

[dependabot[bot]]

Bumps syn from 2.0.69 to 2.0.71.

Release notes

Sourced from syn's releases.

2.0.71

• Do not require mutable borrow in Punctuated::get() (#1706, thanks @​lemunozm)

2.0.70

• Improve parenthesization of closures, jumps, ranges, chained comparisons, and let (#1694, #1695, #1698, #1699, #1700)

Commits

• f34dc7b Release 2.0.71
• 896d58b Merge pull request #1706 from lemunozm/patch-1
• dd7e269 Remove mut from Puntuated::get()
• 5c67e26 Release 2.0.70
• 935c1e1 Configure out more full-only expression kinds in print_expr
• e664375 Merge pull request #1704 from dtolnay/fixup
• f1daf23 Enable expression fixups in 'derive' mode
• 678dbc2 Update test suite to nightly-2024-07-08
• 628e2f7 Ignore needless_update clippy lint
• c3e378c Merge pull request #1703 from dtolnay/cast
• Additional commits viewable in compare view

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