Changelog for the upcomming release (preview)

Changes

• Only Nextcloud 28 and up

Fixes

• Anonymize poll proposal owner in case of hidden results

What's Changed

🚀 Enhancements

• refactor options by @dartcafe in #3145

Other Changes

• Handle users from pseudo user mapper by @dartcafe in #3175

Full Changelog: v6.0.0-beta3...v6.0.0-beta4