Increase test timeout of flaky test.
Increase test timeout of flaky test.

This is to see if this is a timing issue, or a genuine hang. It could also be a timing issue stemming from the two sleep() calls, so they should probably use longer timeouts and every order of operations should be provoked, instead of only one.

gedaiu/vibe.d,chalucha/vibe.d,rejectedsoftware/vibe.d,etcimon/vibe.d,etcimon/vibe.d,Geod24/vibe.d,DBankov/vibe.d