Bump syn from 2.0.82 to 2.0.87

[dependabot[bot]]

Bumps syn from 2.0.82 to 2.0.87.

Release notes

Sourced from syn's releases.

2.0.87

• Add Cursor::any_group (#1777)
• Add Expr::peek (#1778)
• Improve syntax support for enum discriminant expressions in non-"full" mode (#1779)

2.0.86

• Support peeking the end of a parse stream (#1689)
• Allow parse_quote! to produce Vec<Attribute> (#1775)

2.0.85

• Preserve extern static unsafety in ForeignItem::Verbatim (#1773)

2.0.84

• Parse safe and explicitly unsafe extern items (#1768, rust-lang/rust#123743, rust-lang/rfcs#3484)
• Parse self captures: impl Sized + use<Self> (#1772)

2.0.83

• Documentation improvements

Commits

• a777cff Release 2.0.87
• 1f103d4 Merge pull request #1779 from dtolnay/scan
• 0986a66 Ignore enum_glob_use pedantic clippy lint
• ca97c7d Translate expr scanner to table driven
• 8039cb3 Test that every expr can be scanned
• 0132c44 Make scan_expr compilable from integration test
• 7c102c3 Extract non-full expr scanner to module
• ceaf4d6 Merge pull request #1778 from dtolnay/exprpeek
• a890e9d Expose can_begin_expr as Expr::peek
• 12f068c Merge pull request #1777 from dtolnay/anygroup
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like syn is up-to-date now, so this is no longer needed.