fix(bundler): fix global bundler typo

lib/manager/bundler/artifacts.js

@@ -122,7 +122,7 @@ async function getArtifacts(
       cmd += ' && bundle';
     } else {
       logger.info('Running bundler via global bundler');
-      cmd = 'bundler';
+      cmd = 'bundle';
     }
     cmd += ' lock"';
     logger.debug({ cmd }, 'bundler command');