As of 2023-08-19, php8.3-mbstring is the only obvious package that is missing from the deb.sury.org repos that prevents MW from running in the larger extent...
https://www.php.net/archive/2023.php#2023-08-17-1 "PHP 8.3.0 Beta 3 available for testing"
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Resolved | Jdforrester-WMF | T339349 Add experimental PHP 8.3 jobs | |||
| Resolved | Jdforrester-WMF | T339350 Build PHP 8.3 CI images | |||
| Resolved | Reedy | T344555 php8.3-mbstring not packaged yet |
8.3.0~alpha3-1+ubuntu22.04.1+deb.sury.org+1 exists now.
Not updated to the beta, or specifically beta3, yet... But progress.