[ReleasePR recoveryservicessiterecovery] Azure Site Recovery: New version/2021 08 01 (#1928)

Create to sync Azure/azure-rest-api-specs#15841
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...AzureSDKAutomation:sdkAuto/recoveryservicessiterecovery?expand=1)

Author: msftbot[bot]