chore: fix exec test

Author: wraithgar

test/lib/commands/exec.js

@@ -41,6 +41,7 @@ t.test('registry package', async t => {
   })
 
   await registry.package({
+    times: 2,
     manifest,
     tarballs: {
       '1.0.0': path.join(npm.prefix, 'npm-exec-test'),