Enhancement: Update reva to v1.4.1-0.20210111080247-f2b63bfd6825

* Enhancement: calculate and expose actual file permission set [cs3org/reva#1368](https://github.com/cs3org/reva/pull/1368)
* initial range request support [cs3org/reva#1326](https://github.com/cs3org/reva/pull/1388)

https://github.com/owncloud/ocis/pull/1194
https://github.com/cs3org/reva/pull/1368
https://github.com/cs3org/reva/pull/1388