build(deps): bump syn from 1.0.109 to 2.0.71

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.109 to 2.0.71.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@1.0.109...2.0.71)

---
updated-dependencies:
- dependency-name: syn
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Cargo.toml

@@ -337,7 +337,7 @@ smallvec              = { version = "1.13.1" }
 static_assertions     = { version = "1.1.0" }
 strum                 = { version = "0.26.3", default-features = false, features = ["derive"] }
 strum_macros          = { version = "0.26.2" }
-syn                   = { version = "1.0.98", features = ["full", "fold", "extra-traits", "visit"] }
+syn                   = { version = "2.0.71", features = ["full", "fold", "extra-traits", "visit"] }
 tiny-keccak           = { version = "2.0", features = ["fips202"] }
 
 [profile.dev]