It's bizarre that plesk isn't supporting AlmaLinux 9! Active Support for AlmaLinux ends THIS MONTH and Security support ends in just 4 years, 10 months so why bother with AlmaLinux 8 at all and just go to AlmaLinux 9.
Frankly, I put it down to laziness on Plesk's part and a desire to not spend money despite increasing prices a fair bit over the past 2 years. It's your job to support the OS that we are using and will use.