Update dependency NServiceBus.Metrics to v6 #7969

Job	Run time
containers / servicecontrol	2m 26s
containers / servicecontrol-audit	1m 57s
containers / servicecontrol-monitoring	2m 2s
Windows-SQS	3m 8s
windows-installers / build	2m 37s
Windows-PrimaryRavenPersistence	3m 2s
Windows-SqlServer	2m 47s
Windows-PrimaryRavenAcceptance	2m 43s
Windows-AzureServiceBus	2m 31s
Windows-RabbitMQ	3m 16s
db-container / db-container	1m 11s
Linux-SQS	59s
Windows-MSMQ	2m 38s
Linux-Default	1m 0s
Linux-PrimaryRavenAcceptance	1m 2s
Linux-PostgreSQL	1m 15s
Windows-Default	3m 0s
Windows-AzureStorageQueues	3m 16s
Windows-PostgreSQL	2m 57s
Linux-AzureServiceBus	1m 0s
Linux-PrimaryRavenPersistence	57s
Linux-RabbitMQ	58s
Linux-SqlServer	1m 7s
Linux-AzureStorageQueues	59s
container-test / mssql	1m 50s
container-test / asb	3m 14s
container-test / asq	2m 23s
container-test / sqs	2m 5s
container-test / postgresql	1m 16s
container-test / rabbit	1m 49s
	1h 1m 25s

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