Update dependency NUnit to 4.6.0 #8755

Job	Run time
windows-installers / build	1m 49s
db-container / db-container	54s
containers / servicecontrol-monitoring	51s
containers / servicecontrol	1m 2s
containers / servicecontrol-audit	1m 1s
Windows-AzureServiceBus	2m 34s
Linux-IBMMQ	58s
Windows-PrimaryRavenPersistence	2m 21s
Linux-PostgreSQL	56s
Windows-Default	3m 33s
Linux-PrimaryRavenPersistence	52s
Linux-AzureServiceBus	57s
Linux-SQS	50s
Windows-RabbitMQ	2m 43s
Linux-RabbitMQ	47s
Windows-SQS	1m 51s
Windows-MSMQ	2m 11s
Windows-SqlServer	2m 4s
Linux-Default	50s
Linux-PrimaryRavenAcceptance	51s
Windows-PostgreSQL	2m 27s
Windows-PrimaryRavenAcceptance	2m 16s
Linux-AzureStorageQueues	51s
Linux-SqlServer	49s
Windows-AzureStorageQueues	2m 5s
container-test	-1s
	38m 22s

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