Update SwiftSyntax to 60c7037

[jpsim]

This has changes to how comments are associated to nodes.

See swiftlang/swift-syntax#985

[SwiftLintBot]

	1 Warning
⚠️	If this is a user-facing change, please include a CHANGELOG entry to credit yourself! You can find it at CHANGELOG.md.

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📖	This PR fixed a violation in Firefox: /Sync/Synchronizers/HistorySynchronizer.swift:198:16: warning: Closure Spacing Violation: Closure expressions should have a single space inside each brace. (closure_spacing)

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* Update SwiftSyntax to `60c7037`.  
  [jpsim](https://github.com/jpsim)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

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[jpsim]

There are some regressions here I need to fix.