Bump NLog.Extensions.Logging from 5.3.15 to 5.4.0 in /src #6089

Job	Run time
Windows-Default	12m 30s
containers	0s
windows-installers	0s
db-container	0s
Windows-SqlServer	6m 32s
Windows-AzureServiceBus	10m 4s
Windows-RabbitMQ	7m 30s
Windows-AzureStorageQueues	6m 12s
Windows-MSMQ	4m 40s
Windows-SQS	7m 41s
Windows-PrimaryRavenAcceptance	13m 14s
Windows-PrimaryRavenPersistence	6m 56s
Windows-PostgreSQL	7m 24s
Linux-Default	9m 56s
Linux-SqlServer	3m 48s
container-test	0s
Linux-AzureServiceBus	9m 40s
Linux-RabbitMQ	3m 53s
Linux-AzureStorageQueues	4m 3s
Linux-SQS	4m 55s
Linux-PrimaryRavenAcceptance	10m 14s
Linux-PrimaryRavenPersistence	4m 20s
Linux-PostgreSQL	3m 10s
	2h 16m 42s

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