Wait a little longer for our repeated task (#2064)
Wait a little longer for our repeated task (#2064)

Motivation:

We currently expect two runs of a repeated task in a test to happen with
relatively little breathing room: the minimum delay is 10ms, and we
won't wait longer than 50ms. We should widen this a bit.

Modifications:

- Double the deadline from 50ms to 100ms.

Result:

This test passes consistently.

Resolves #2053.
apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio