Bump syn from 2.0.103 to 2.0.104 (#1358)

Author: dependabot[bot]

Cargo.lock

@@ -25,7 +25,7 @@ version = "1.0"
 features = [ "derive" ]
 
 [dependencies.syn]
-version = "2.0.103"
+version = "2.0.104"
 features = [ "full", "visit", "extra-traits" ]
 
 [dev-dependencies]