chore(deps): bump syn from 3.0.3 to 3.0.4 (#1775)

Bumps [syn](https://github.com/dtolnay/syn) from 3.0.3 to 3.0.4.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@3.0.3...3.0.4)

---
updated-dependencies:
- dependency-name: syn
  dependency-version: 3.0.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]