build(deps): update syn requirement from 1.0 to 2.0 (#834)

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...2.0.39)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

generator/Cargo.toml

@@ -18,5 +18,5 @@ vk-parse = { version = "0.12", features = ["vkxml-convert"] }
 vkxml = "0.3"
 
 [dependencies.syn]
-version = "1.0"
+version = "2.0"
 features = ["full", "extra-traits"]