Update dependency NLog.Extensions.Logging to v6 #8070

Job	Run time
windows-installers / build	2m 16s
containers / servicecontrol-audit	1m 33s
containers / servicecontrol	1m 23s
db-container / db-container	54s
containers / servicecontrol-monitoring	1m 8s
Windows-MSMQ	1m 50s
Windows-AzureStorageQueues	2m 18s
Windows-PrimaryRavenAcceptance	1m 49s
Linux-AzureStorageQueues	1m 18s
Linux-SQS	1m 12s
Windows-SQS	2m 1s
Linux-RabbitMQ	1m 8s
Windows-PrimaryRavenPersistence	2m 21s
Windows-RabbitMQ	2m 19s
Linux-PrimaryRavenAcceptance	1m 9s
Linux-Default	59s
Linux-SqlServer	58s
Windows-AzureServiceBus	1m 52s
Linux-AzureServiceBus	1m 30s
Windows-PostgreSQL	2m 24s
Windows-SqlServer	3m 3s
Linux-PrimaryRavenPersistence	1m 6s
Windows-Default	1m 57s
Linux-PostgreSQL	1m 3s
container-test	0s
	39m 31s

Provide feedback