Enhancement: Update ownCloud Web to v5.4.0

Tags: web

We updated ownCloud Web to v5.4.0. Please refer to the changelog (linked) for details on the web release.

https://github.com/owncloud/web/pull/6709
https://github.com/owncloud/ocis/pull/3437
https://github.com/owncloud/ocis/pull/3487
https://github.com/owncloud/ocis/pull/3509
https://github.com/owncloud/web/releases/tag/v5.4.0
