Bump syn from 2.0.28 to 2.0.29

[dependabot[bot]]

Bumps syn from 2.0.28 to 2.0.29.

Release notes

Sourced from syn's releases.

2.0.29

• Partially work around rust-analyzer bug (rust-lang/rust-analyzer#9911)

Commits

• b387b13 Release 2.0.29
• 1faea07 Partially work around ridiculous rust-analyzer behavior
• 24d6ef4 Merge pull request #1494 from dtolnay/primitive
• 47dc5d0 Switch to using primitives in macro-generated code through std::primitive
• 020fe20 Update test suite to nightly-2023-08-05
• f561339 Update test suite to nightly-2023-08-04
• See full diff in compare view

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[liamaharon]

Probably needs a cumulus companion https://gitlab.parity.io/parity/mirrors/polkadot/-/jobs/3420831

I'll look into it tomorrow if no one else beats me to it

[liamaharon]

bot rebase

[paritytech-processbot[bot]]

Rebased