Bump syn from 1.0.60 to 1.0.67

[dependabot[bot]]

Bumps syn from 1.0.60 to 1.0.67.

Release notes

Sourced from syn's releases.

1.0.67

• Accept outer attributes in the Parse impl of ExprBlock (#1004)

1.0.66

• Parse equality constraints on generic associated types (#979)
• Parse default value exprs in const generic declarations (#980)
• Fix infinite loop parsing malformed type ascription expression in non-full mode (#978)
• Improve Parse impls of ExprArray, ExprAsync, ExprBlock, ExprMacro, ExprParen, ExprRepeat, ExprStruct, ExprTryBlock, ExprUnsafe to succeed parsing even in the presence of trailing binary operators (#991, #992, #993, #994, #995, #996, #997, #998, #999)

1.0.65

• Parse visibility on macro_rules (#981, tracking issue rust-lang/rust#78855)
• Parse leading vert in or-patterns (#982, matching the Rust grammar change in rust-lang/rust#81869)
• Parse static with omitted type (#983)
• Parse placeholder type in type parameter position (#984)

1.0.64

• Avoid clippy::expl_impl_clone_on_copy pedantic lint in downstream custom token types (#976)

1.0.63

• Fix parsing associated types with empty trait bound list after colon (#974)

1.0.62

• Republish to work around docs.rs bug rust-lang/docs.rs#1300

1.0.61

• Improve assertion failures on invalid use of Punctuated API (#970, thanks @​osa1)
• Add Lifetime::span and Lifetime::set_span accessors (#971)

Commits

• eede299 Release 1.0.67
• 359297f Merge pull request #1004 from dtolnay/blockattr
• 310df0c Parse outer attrs on ExprBlock
• ee66f12 Release 1.0.66
• c37d618 Merge pull request #1002 from dtolnay/castprecedence
• 5ced044 Report no precedence for : binary operator in non-full mode
• 725fca7 Merge pull request #1001 from dtolnay/gat
• 69e5f70 Resolve collapsible_if lint in generic associated type equality parsing
• d3b0276 Parse generic associated type equality constraint
• 1a31fb2 Merge pull request #1000 from dtolnay/constdefault
• Additional commits viewable in compare view

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