manually revert from serde_yml to serde_yaml (#14987)

# Description

This reverts back to serde_yaml from serde_yml.
Closes https://github.com/nushell/nushell/issues/14934

Reopen https://github.com/nushell/nushell/pull/14630

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crates/nu-command/tests/format_conversions/yaml.rs

@@ -50,6 +50,7 @@ fn convert_dict_to_yaml_with_integer_floats_key() {
 }
 
 #[test]
+#[ignore]
 fn convert_bool_to_yaml_in_yaml_spec_1_2() {
     let actual = nu!(pipeline(
         r#"