Update syn to 2 (#855)

Author: jasl

rlp-derive/Cargo.toml

@@ -12,7 +12,7 @@ rust-version = "1.56.1"
 proc-macro = true
 
 [dependencies]
-syn = "1.0.14"
+syn = "2.0.72"
 quote = "1.0.2"
 proc-macro2 = "1.0.8"
 

rlp-derive/src/de.rs

@@ -121,7 +121,7 @@ fn decodable_field(
 	let list = quotes.list;
 
 	let attributes = &field.attrs;
-	let default = if let Some(attr) = attributes.iter().find(|attr| attr.path.is_ident("rlp")) {
+	let default = if let Some(attr) = attributes.iter().find(|attr| attr.path().is_ident("rlp")) {
 		if *default_attribute_encountered {
 			panic!("only 1 #[rlp(default)] attribute is allowed in a struct")
 		}