Flaky test-benchmark-timers

https://ci.nodejs.org/job/node-test-commit-freebsd/15450/nodes=freebsd10-64/console
https://ci.nodejs.org/job/node-test-commit-linux-containered/2130/nodes=ubuntu1604_sharedlibs_debug_x64/console

```
14:47:30 not ok 205 parallel/test-benchmark-timers
14:47:30   ---
14:47:30   duration_ms: 480.136
14:47:30   severity: fail
14:47:30   stack: |-
14:47:30     timeout
```