v8.12.3

[8.12.3] - 2023-08-22

Fixed

• Fix bug preventing request.is_preview from being set (@marteinn)
• Hide wagtail userbar when in preview panel (@marteinn)
• Make sure in_preview_panel is set (@marteinn)
• Drop non running get_preview_url override from base page (@marteinn)

Removed

• Remove deprecated wagtail.contrib.modeladmin app from INSTALLED_APPS (@marteinn)

Full Changelog: v8.12.2...v8.12.3