Update syn requirement from 1.0 to 2.0 (#3890)

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@1.0.0...2.0.3)

---
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>

parquet_derive/Cargo.toml

@@ -34,5 +34,5 @@ proc-macro = true
 [dependencies]
 proc-macro2 = { version = "1.0", default-features = false }
 quote = { version = "1.0", default-features = false }
-syn = { version = "1.0", features = ["extra-traits"] }
+syn = { version = "2.0", features = ["extra-traits"] }
 parquet = { path = "../parquet", version = "35.0.0", default-features = false }