Unfortunately, not yet. We have a team that has been hard at work on the 2.7 release, which includes a different major dependency upgrade - beginning the process of moving from Bootstrap 2.3.2 to Bootstrap 5.x.
This has been a very large undertaking, the full breadth of which needs to be planned for across multiple major release to allow for a deprecation period (so we don't immediately break everyone's custom themes by just removing BS2.3.2 support in the next AtoM version), at a time when Artefactual is both very busy and undergoing some internal reorganization. To avoid delaying the long-overdue 2.7 release any further, additional major dependency upgrades will be put off until a future release.
AtoM 2.7 will therefore support PHP 7.4 - and I would expect that some of the breaking changes in PHP8 will mean that this version will not run properly with PHP8. We will address this in a future release, but at present I can't offer a hard timeline on this. That said, we have a dedicated security officer role at Artefactual, and we will continue monitoring for any critical PHP vulnerabilities and preparing patches when relevant.