Thanks @Avi,
It looks like you should be able to upgrade within Kali using the package manager, but you will need to have an up to date Kali install within the VM. If you have a current Kali install but still don’t see it available, take a look at the Kali forum to see if they have recommendations: https://forums.kali.org/
Also, there is information about updating and upgrading Kali here: https://www.kali.org/docs/general-use/updating-kali/
The release announcement for GVM 21.04 which includes GSA is here: GVM 21.04 (stable, initial release 2021-04-16)