change ParseErrors field to pub(crate)

Author: khieta

cedar-policy-core/src/parser/err.rs

@@ -671,7 +671,7 @@ pub fn expected_to_string(expected: &[String], config: &ExpectedTokenConfig) ->
 // Don't make fields `pub`, don't make breaking changes, and use caution when
 // adding public methods.
 #[derive(Clone, Debug, Default, PartialEq, Eq)]
-pub struct ParseErrors(pub Vec<ParseError>);
+pub struct ParseErrors(pub(crate) Vec<ParseError>);
 
 impl ParseErrors {
     const DESCRIPTION_IF_EMPTY: &'static str = "unknown parse error";