Bugfix: Bump reva to 2.16.2

*   Bugfix [cs3org/reva#4251](https://github.com/cs3org/reva/pull/4251): ldap: fix GetUserByClaim for binary encoded UUIDs

https://github.com/owncloud/ocis/pull/7512
https://github.com/owncloud/ocis/issues/7469
