chore(deps): bump syn from 0.15.34 to 0.15.35

Created by: dependabot-preview[bot]

Bumps syn from 0.15.34 to 0.15.35.

Release notes

Sourced from syn's releases.

0.15.35

• Transpose unsafe async fn to async unsafe fn (https://github-redirect.dependabot.com/rust-lang/rust/pull/61319)

Commits

• 848f676 Release 0.15.35
• 5b351e5 Emit main in dev crate whether or not there is error
• 62bdd84 Fix token order of async unsafe fn
• 7ee1d63 Use interned symbol doc
• b7f1e9b Update test suite to nightly-2019-06-08
• 5438994 Update test suite to nightly-2019-06-07
• 2c8fc61 Update test suite to nightly-2019-06-05
• 479881f Ignore some lints to support old compilers
• e52022b Remove parsing placement expr
• d502e4b Implement parsing const generic params
• Additional commits viewable in compare view

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