Update dependency ReactiveUI.WPF to v23 #8736

Job	Run time
windows-installers / build	2m 25s
db-container / db-container	1m 10s
containers / servicecontrol-monitoring	59s
containers / servicecontrol	1m 0s
containers / servicecontrol-audit	1m 2s
Windows-RabbitMQ	2m 8s
Windows-AzureStorageQueues	2m 20s
Windows-MSMQ	2m 21s
Windows-SqlServer	2m 14s
Windows-AzureServiceBus	2m 24s
Windows-SQS	2m 10s
Windows-Default	2m 12s
Windows-PrimaryRavenPersistence	2m 13s
Windows-PrimaryRavenAcceptance	2m 18s
Linux-AzureStorageQueues	48s
Linux-SQS	48s
Linux-Default	1m 4s
Linux-AzureServiceBus	56s
Linux-SqlServer	50s
Windows-PostgreSQL	2m 12s
Linux-PrimaryRavenAcceptance	57s
Linux-RabbitMQ	51s
Linux-PostgreSQL	50s
Linux-IBMMQ	50s
Linux-PrimaryRavenPersistence	55s
container-test	-1s
	37m 56s

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