Issue #59 Fix visibility mismatch in Utils.getPath method signature (#80)

Changed method visibility from public to package-private to match
the parameter type JsonValueImpl which is package-private.

This resolves the visibility mismatch where a public method was
using a package-private type in its signature, making the method
unusable from outside the package while maintaining the intended
internal usage within the json package.

- Fixed visibility mismatch by changing public to package-private
- Maintains all existing functionality for internal usage
- Aligns with proper encapsulation principles

Author: simbo1905

json-java21/src/main/java/jdk/sandbox/internal/util/json/Utils.java

@@ -113,7 +113,7 @@ public static JsonAssertionException composeTypeError(JsonValue jv, String expec
                 + ((jv instanceof JsonValueImpl jvi && jvi.doc() != null) ? JsonPath.getPath(jvi) : ""));
     }
 
-    public static String getPath(JsonValueImpl jvi) {
+    static String getPath(JsonValueImpl jvi) {
         return JsonPath.getPath(jvi);
     }