fix(deps): update rust crate syn to v2

Author: renovate[bot]

safe-builder-derive/Cargo.toml

@@ -12,6 +12,6 @@ proc-macro = true
 [dependencies]
 quote = "^1.0"
 proc-quote = "0.3.2"
-syn = { version = "^1.0", features = ["parsing"] }
+syn = { version = "^2.0.51", features = ["parsing"] }
 proc-macro2 = "^1.0"
 convert_case = "^0.4.0"