Drupal9 fails after updating

[tc60045]

Drupal9 works but is built with an old, security-compromised Drupal Core version.
Update that with composer / drush and you get lates Drupal, but errors = php version too old (7.4)
That is tricky to upgrade for debian, with lots of caveats / third party libraries for php (ugh)

6 months is a pretty good run for a release (= time since last updated); could someone re-roll the image with php 8.1-latest + drupal9-latest?

Thanks!