chore(deps): update dependency syn to v3

Author: renovate[bot]

blueprint/macros/Cargo.toml.liquid

@@ -14,4 +14,4 @@ generated_with = "{{gerust_version}}"
 
 [dependencies]
 quote = "1.0"
-syn = {  version = "2.0", features = ["full"] }
+syn = {  version = "3.0", features = ["full"] }