build: use ModelUtils for getAdditionalProperties

Signed-off-by: Tiago Castro <[email protected]>

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustMayastorCodegen.java

@@ -515,7 +515,7 @@ public String getTypeDeclaration(Schema p) {
             }
             return "Vec<" + getTypeDeclaration(inner) + ">";
         } else if (ModelUtils.isMapSchema(p)) {
-            Schema inner = getAdditionalProperties(p);
+            Schema inner = ModelUtils.getAdditionalProperties(p);
             if (inner == null) {
                 LOGGER.warn("{}(map property) does not have a proper inner type defined. Default to string", p.getName());
                 inner = new StringSchema().description("TODO default missing map inner type to string");