Remove unused dependencies and dead code warnings

src/path_serializer.rs

@@ -36,17 +36,3 @@ where
 
     seq.end()
 }
-
-pub fn serialize_option_absolute<S, T>(
-    maybe_path: &Option<T>,
-    serializer: S,
-) -> Result<S::Ok, S::Error>
-where
-    S: Serializer,
-    T: AsRef<Path>,
-{
-    match maybe_path {
-        Some(path) => serialize_absolute(path, serializer),
-        None => serializer.serialize_none(),
-    }
-}