investigate flaky parallel/test-tls-server-verify on Windows

[Trott]

• Version: 10.0.0-pre
• Platform: win2016, vs2017
• Subsystem: test

https://ci.nodejs.org/job/node-test-binary-windows/14353/COMPILED_BY=vs2017,RUNNER=win2016,RUN_SUBSET=3/console

not ok 410 parallel/test-tls-server-verify
  ---
  duration_ms: 120.355
  severity: fail
  stack: |-
    timeout

[apapirovski]

@addaleax I believe this only started occurring after the revert in ea7400c

[MylesBorins]

This is starting to fail on 6.x
https://ci.nodejs.org/job/node-test-binary-windows/14430/COMPILED_BY=vs2015,RUNNER=win2016,RUN_SUBSET=3/console

not ok 294 parallel/test-tls-server-verify
  ---
  duration_ms: 60.346
  severity: fail
  stack: |-
    timeout
  ...

[MylesBorins]

The two new commits landed on v6.x are

• 809858c - crypto: expose ECDH class (7 days ago)
• 6014d66 - crypto: add randomFill and randomFillSync (7 days ago)

[gibfahn]

Failing on v8.x as well.

[Trott]

Proposed fix in #18382