Update syn requirement from 1.0.0 to 2.0.6

Updates the requirements on [syn](https://github.com/dtolnay/syn) to permit the latest version.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](https://github.com/dtolnay/syn/compare/1.0.0...2.0.6)

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

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

sv-parser-macros/Cargo.toml

@@ -19,4 +19,4 @@ doctest = false
 
 [dependencies]
 quote = "1.0.0"
-syn   = { version = "1.0.0", features = ["full", "fold", "parsing", "extra-traits"] }
+syn   = { version = "2.0.6", features = ["full", "fold", "parsing", "extra-traits"] }