16.0.10 RC1

[rullzer]

• [stable16] Do not use the instance name as user part of from mail addresses #19926 Do not use the instance name as user part of from mail addresses
• [Security] Bump acorn from 6.1.1 to 6.4.1 #19946 Bump acorn from 6.1.1 to 6.4.1
• [stable16] Fix default action for deleted shares #19984 Fix default action for deleted shares
• [stable16] Default value of lookupServerEnabled should be the same everywhere #20002 Default value of lookupServerEnabled should be the same everywhere
• [stable16] Update the target when it isempty after sharing #20018 Update the target when it isempty after sharing
• [stable16] fixes auto-detecting UUID attributes #20048 Fixes auto-detecting UUID attributes
• [stable16] Force compatible dependency versions in acceptance tests #20053 Force compatible dependency versions in acceptance tests
• [stable16] Remove admin_notifications since it is obsolete since Nextcloud 14 #20142 Remove admin_notifications since it is obsolete since Nextcloud 14
• [stable16] Fix PDF and video viewers on public links #20147 Fix PDF and video viewers on public links
• [stable16] Bugfix - Prevent PHP Warning for count on null on LDAP #20177 Bugfix - Prevent PHP Warning for count on null on LDAP
• [stable16] Remove Acrobat logo from PDF filetype icon #20240 Remove Acrobat logo from PDF filetype icon
• [stable16] Catch NotFoundException when getting the user folder #20337 Catch NotFoundException when getting the user folder
• activity#443 Email activity is missing information
• firstrunwizard#302 Bump acorn from 6.1.1 to 6.4.1
• notifications#591 Bump acorn from 6.1.1 to 6.4.1
• recommendations#198 Bump acorn from 6.1.1 to 6.4.1

Pending PRs:

• [stable16] Fix occ maintenance:install database connect failure #19328 Fix occ maintenance:install database connect failure @backportbot-nextcloud
• [stable16] fix OCA\DAV\CalDAV\CalDavBackend search $options #20190 Fix OCA\DAV\CalDAV\CalDavBackend search $options @tcitworld
• files_pdfviewer#171 Bump pdf.js to 2.1.266 @backportbot-nextcloud

[MorrisJobke]

@ChristophWurst please rebase