Update syn requirement from 1.0.16 to 2.0.47

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@1.0.16...2.0.47)

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

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

orientdb-macro/Cargo.toml

@@ -14,5 +14,5 @@ proc-macro = true
 
 [dependencies]
 proc-macro2 = { version = "1.0.9" }
-syn = { version = "1.0.16", features = [ "full" ] }
+syn = { version = "2.0.47", features = [ "full" ] }
 quote = { version = "1.0.2"}