ci: bump syn from 2.0.118 to 3.0.3

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.118 to 3.0.3.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@2.0.118...3.0.3)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.lock

@@ -18,7 +18,7 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1"
 quote = "1"
-syn = { version = "2", features = ["full", "extra-traits", "visit"] }
+syn = { version = "3", features = ["full", "extra-traits", "visit"] }
 
 [lints]
 workspace = true