Bump syn from 1.0.50 to 1.0.51
Bump syn from 1.0.50 to 1.0.51

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.50 to 1.0.51.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](https://github.com/dtolnay/syn/compare/1.0.50...1.0.51)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
ryanfowler/lines