Bump syn from 1.0.98 to 1.0.99

[dependabot[bot]]

Bumps syn from 1.0.98 to 1.0.99.

Release notes

Sourced from syn's releases.

1.0.99

• Add categories and keywords to crates.io metadata

Commits

• 60ecbac Release 1.0.99
• b8619c8 Update keywords in crates.io metadata
• 18ad352 Add parser-implementations category to crates.io metadata
• 5bb3ccc Add authors to Cargo.toml
• d9da9c9 Sort package entries in Cargo.toml
• fadc8e9 Update test suite to nightly-2022-07-31
• f1089e3 Ignore assertions_on_result_states clippy lint
• 470025c Merge pull request #1205 from dtolnay/groups
• 07a82b3 Eliminate allocation of 'groups' vector in TokenBuffer construction
• 5483326 Merge pull request #1204 from dtolnay/prealloc
• Additional commits viewable in compare view

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