chore(release): Changelog for 19.0.0-rc.1

[nickvergessen]

Added

• Add a header to the room list indicating pending invites #11944

Changed

• Update translations
• Update several dependencies

Fixed

• Don't close the modal on outside click when the user started to fill them #11942
• Fix user confusion when federating with a user that has the same user ID #11941
• Don't transfer ownership federated memberships as it doesn't work #11950
• Provide the correct container for the file picker #11939
• Adjust the cursor to be a grabbing hand when dragging the presenter view #11903
• Fix file names overflowing the box when chat is in the right sidebar #11937