Bugfix: Update reva to v2.19.6

We updated reva to v2.19.6

*   Bugfix      [cs3org/reva#4654](https://github.com/cs3org/reva/pull/4654): Write blob based on session id
*   Bugfix      [cs3org/reva#4666](https://github.com/cs3org/reva/pull/4666): Fix uploading via a public link
*   Bugfix      [cs3org/reva#4665](https://github.com/cs3org/reva/pull/4665): Fix creating documents in nested folders of public shares
*   Enhancement [cs3org/reva#4655](https://github.com/cs3org/reva/pull/4655): Bump mockery to v2.40.2
*   Enhancement [cs3org/reva#4664](https://github.com/cs3org/reva/pull/4664): Add ScanData to Uploadsession

https://github.com/owncloud/ocis/pull/9011
