Bugfix: Update reva to v2.19.5

We updated reva to v2.19.5

*   Bugfix [cs3org/reva#4626](https://github.com/cs3org/reva/pull/4626): Fix public share update
*   Bugfix [cs3org/reva#4634](https://github.com/cs3org/reva/pull/4634): Fix access to files withing a public link targeting a space root

https://github.com/owncloud/ocis/pull/8873
