Enhancement: Bump Web to 12.3.0


Bugfix [owncloud/web#13406](https://github.com/owncloud/web/pull/13406): Prevent overlapping search content
Bugfix [owncloud/web#13415](https://github.com/owncloud/web/pull/13415) Filter only personal trashed spaces
Enhancement [owncloud/web#5847](https://github.com/owncloud/web/pull/5847) Dynamic theme-color meta tag based on loaded theme
Enhancement [owncloud/web#13412](https://github.com/owncloud/web/pull/13412) Use beta endpoint for single drive operations
Enhancement [owncloud/web#13426](https://github.com/owncloud/web/pull/13426) Add crash page
Enhancement [owncloud/web#13426](https://github.com/owncloud/web/pull/13426)Catch spaces loading error
Enhancement [owncloud/web#13485](https://github.com/owncloud/web/pull/13485)Drop custom share filters
Enhancement [owncloud/web#13499](https://github.com/owncloud/web/pull/13499)Add cross-instance reference
Enhancement [owncloud/web#13500](https://github.com/owncloud/web/pull/13500)Add instance switcher


https://github.com/owncloud/web/pull/13519
https://github.com/owncloud/web/releases/tag/v12.3.0
