Flaky test-zlib-from-string

[BridgeAR]

https://ci.nodejs.org/job/node-test-commit-linux/16305/nodes=debian8-x86/console

not ok 1869 parallel/test-zlib-from-string
  ---
  duration_ms: 0.135
  severity: fail
  stack: |-

[BridgeAR]

I am closing the reports without stack traces. I have the feeling this got resolved. If they come back, we can check again what to do.