Bump syn from 1.0.91 to 1.0.94

[dependabot[bot]]

Bumps syn from 1.0.91 to 1.0.94.

Release notes

Sourced from syn's releases.

1.0.94

• Resolve some unused_macro_rules warnings

1.0.93

• Fix compile error when Some means something unusual in the expression namespace of the scope where custom_keyword is invoked (#1171, thanks @​zakarumych)

1.0.92

• Make compatible with Miri's tag-raw-pointers mode (#1166, thanks @​saethlin)

Commits

• fd1a51c Release 1.0.94
• f1396f5 Yet another unused macro rules lint
• 209165e Merge unknown_lints + unused_macro_rules attribute
• 2fc9b71 Format with rustfmt 1.4.38
• accffbf Fix unused macro rule in no-default-features mode
• e3798ce Fix obsolete rule in ast_enum_of_structs
• 16315f5 Fix obsolete rule in check_keyword_matches
• 189c60c Ignore unused_macro_rules warning in test macros
• 11b4a93 Remove doc(hidden) attribute that is being phased out
• 2e505a8 Release 1.0.93
• Additional commits viewable in compare view

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Dependabot will merge this PR once CI passes on it, as requested by @smoelius.

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[smoelius]

@dependabot squash and merge

[dependabot[bot]]

One of your CI runs failed on this pull request, so Dependabot won't merge it.

Dependabot will still automatically merge this pull request if you amend it and your tests pass.

[dependabot[bot]]

Superseded by #213.