logs: info not warn for no packageFile content

lib/workers/repository/extract/manager-files.js

@@ -56,7 +56,7 @@ async function getManagerPackageFiles(config, managerConfig) {
         });
       }
     } else {
-      logger.warn({ packageFile }, 'Found not content for packageFile');
+      logger.info({ packageFile }, 'packageFile has no content');
     }
   }
   await postExtract(manager, packageFiles);