fix the dump tests

The issue was linked to the fact that the debug implementation of the PhantomData wasn't the same between rust stable and rust nightly.
This was causing an issue while snapshsotting the settings and this commit fix it by representing the settings as json which already ignores the PhantomData

dump/src/lib.rs

@@ -417,7 +417,6 @@ pub(crate) mod test {
     }
 
     #[test]
-    #[ignore]
     fn test_creating_and_read_dump() {
         let mut file = create_test_dump();
         let mut dump = DumpReader::open(&mut file).unwrap();