Bump syn from 1.0.70 to 1.0.71

[dependabot-preview]

Bumps syn from 1.0.70 to 1.0.71.

Release notes

Sourced from syn's releases.

1.0.71

• Fix panic deserializing an ItemImpl with a non-path in trait position (#1023)
• Parse visibility on impl blocks (#1024)
• Fix parsing a type parameter default on the first generic parameter of an impl block (#1025, thanks @​taiki-e)

Commits

• a482434 Release 1.0.71
• bc383c5 Merge pull request #1025 from taiki-e/impl-type-parameter-defaults
• 6dc5c73 Merge pull request #1026 from taiki-e/get_or_insert_with
• beb5789 Use Option::get_or_insert_with in Generics::make_where_clause
• 70f8b8e Add impl type parameter defaults test
• f6f10fd Parse type parameter defaults on impl blocks
• e6f9080 Merge pull request #1024 from dtolnay/pubimpl
• e19da82 Add impl visibility test
• 408525d Parse visibility on impl blocks
• 7065998 Merge pull request #1023 from dtolnay/implfor
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 95.584% when pulling 34774ff on dependabot/cargo/syn-1.0.71 into f4c89d7 on master.