Bump syn from 1.0.75 to 1.0.76

[dependabot[bot]]

Bumps syn from 1.0.75 to 1.0.76.

Release notes

Sourced from syn's releases.

1.0.76

• Parse unstable let–else syntax (#1050, #1057)
• Parse qualified braced variant expressions and patterns: <E>::V {..} (#1058, #1059)
• Fix precedence of outer attributes in front of an assignment expression in statement position (#1060)

Commits

• 8820d73 Release 1.0.76
• 51fd31c Bypass parenthesizing attrs that contain an interpolated nonterminal expr
• f95f96e Remove a test exclude that got fixed upstream in rustc
• 97106b1 Merge pull request #1060 from dtolnay/attrassign
• c09a2e5 Fix precedence of attrs on assignment expr in stmt position
• a2701a0 Merge pull request #1059 from dtolnay/qvpat
• ebb9e43 Parse qualified braced variant in pattern position
• d195790 Merge pull request #1058 from dtolnay/qvexpr
• f2eaa7c Parse qualified braced variant in expression position
• e9eafa0 Distinguish the two failures involving qualified braced variant
• Additional commits viewable in compare view

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[mbrobbel]

bors r+

[bors[bot]]

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