Update dependency RavenDB.Embedded to 6.2.15 #8825

Job	Run time
windows-installers / build	6m 41s
containers / servicecontrol-monitoring	2m 1s
containers / servicecontrol-audit	2m 6s
containers / servicecontrol	2m 14s
db-container / db-container	1m 7s
Windows-AzureServiceBus	11m 43s
Windows-RabbitMQ	10m 52s
Windows-PrimaryRavenAcceptance	13m 59s
Windows-SqlServer	7m 55s
Windows-MSMQ	4m 32s
Windows-PrimaryRavenPersistence	6m 41s
Windows-SQS	6m 5s
Linux-Default	8m 12s
Linux-SqlServer	3m 40s
Linux-AzureStorageQueues	3m 26s
Windows-PostgreSQL	5m 44s
Linux-PrimaryRavenPersistence	2m 52s
Windows-Default	14m 17s
Linux-SQS	3m 46s
Linux-RabbitMQ	8m 1s
Linux-PostgreSQL	5m 2s
Linux-IBMMQ	3m 18s
Windows-AzureStorageQueues	6m 23s
Linux-PrimaryRavenAcceptance	2m 57s
Linux-AzureServiceBus	9m 8s
container-test / mssql	1m 36s
container-test / asq	2m 50s
container-test / rabbit	1m 41s
container-test / sqs	1m 59s
container-test / postgresql	1m 41s
container-test / asb	2m 54s
	2h 45m 23s

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