Enhancement: Update reva to v1.7.1-0.20210430154404-69bd21f2cc97

* Fix recycle to different locations (https://github.com/cs3org/reva/pull/1541)
* Fix user share as grantee in json backend (https://github.com/cs3org/reva/pull/1650)
* Introduce named services (https://github.com/cs3org/reva/pull/1509)
* Improve json marshalling of share protobuf messages (https://github.com/cs3org/reva/pull/1655)
* Cache resources from share getter methods in OCS (https://github.com/cs3org/reva/pull/1643)
* Fix public file shares (https://github.com/cs3org/reva/pull/1666)

https://github.com/owncloud/ocis/pull/2010

