Chore(deps): Bump syn from 3.0.2 to 3.0.3 (#1866)

Bumps [syn](https://github.com/dtolnay/syn) from 3.0.2 to 3.0.3.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](https://github.com/dtolnay/syn/compare/3.0.2...3.0.3)

---
updated-dependencies:
- dependency-name: syn
  dependency-version: 3.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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