Increase QtGrpcClientEnd2EndTest::messageWritten timeout


It has been observed to fail on macOS when the VMs are hosted on
macOS 27 hosts, where a 5000ms timeout was too little, but 5300ms
was enough.

Pick-to: 6.12 6.8
Change-Id: Iaa8d4fe56b5fa355fe212ba45b380c2cabda5693
Reviewed-by: Dennis Oberst <dennis.oberst@qt.io>
Reviewed-by: Jukka Jokiniva <jukka.jokiniva@qt.io>
Reviewed-by: Aku Pietikäinen <aku.pietikainen@qt.io>
commitd469964dab4fcef084fc7cf974d4126dfa09dac8
parent509a0435e609eb88df7527e1fddb6aeeac7b3eb1
authorTor Arne Vestbø <tor.arne.vestbo@qt.io>
committerTor Arne Vestbø <tor.arne.vestbo@qt.io>
commit timeMon, 21 Sep 2026 11:05:25 +0000