fix: changed data type to preserve order of schema attributes (#585)

Co-authored-by: Sabarinathan S <[email protected]>

Author: sabarinathan590

src/main/java/com/networknt/schema/PropertiesValidator.java

@@ -29,7 +29,7 @@
 public class PropertiesValidator extends BaseJsonValidator implements JsonValidator {
     public static final String PROPERTY = "properties";
     private static final Logger logger = LoggerFactory.getLogger(PropertiesValidator.class);
-    private final Map<String, JsonSchema> schemas = new HashMap<String, JsonSchema>();
+    private final Map<String, JsonSchema> schemas = new LinkedHashMap<>();
 
     public PropertiesValidator(String schemaPath, JsonNode schemaNode, JsonSchema parentSchema, ValidationContext validationContext) {
         super(schemaPath, schemaNode, parentSchema, ValidatorTypeCode.PROPERTIES, validationContext);