build(deps): bump syn in /userspace/ksud in the crates group

Bumps the crates group in /userspace/ksud with 1 update: [syn](https://github.com/dtolnay/syn).


Updates `syn` from 2.0.71 to 2.0.72
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@2.0.71...2.0.72)

---
updated-dependencies:
- dependency-name: syn
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: crates
...

Signed-off-by: dependabot[bot] <[email protected]>