Update test fixture for new serde_yaml
@@ -439,11 +439,10 @@ fn yaml_round_trip() {
let yaml = serde_yaml::to_string(&values).unwrap();
expect_test::expect![[r#"
- ---
vec:
Int: 123
String: FooBar
- Unit: ~
+ Unit: null
Tuple:
- 1
- Middle
