Use get_new_oval_xml endpoint in packages_exporter script (#1038)

scripts/exporters/packages_exporter.py

@@ -269,7 +269,7 @@ async def get_oval_xml(
         platform_name: str,
         only_released: bool = False,
     ):
-        endpoint = "errata/get_oval_xml/"
+        endpoint = "errata/get_new_oval_xml/"
         return await self.make_request(
             "GET",
             endpoint,