build(deps): update syn requirement from 2.0.38 to 3.0.3

Updates the requirements on [syn](https://github.com/dtolnay/syn) to permit the latest version.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@2.0.38...3.0.3)

---
updated-dependencies:
- dependency-name: syn
  dependency-version: 3.0.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

compio-macros/Cargo.toml

@@ -14,6 +14,6 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0.69"
 quote = "1.0.33"
-syn = { version = "2.0.38", features = ["full"] }
+syn = { version = "3.0.3", features = ["full"] }
 proc-macro-crate = "3.0.0"
 darling = "0.23"