Description of problem:
No vm hardware version 20 and 21 is present which is needed for VMware 8 provisioning

Version-Release number of selected component (if applicable):
6.15

How reproducible:
Always

Steps to Reproduce:
1. Create a VMware compute resource with vCenter 8
2. Try to select vm hardware version 20 or 21

Actual results:
vm hardware version 20 or 21 missing.

Expected results:
vm hardware version 20 or 21 should be present

Additional info:
There is already a issue created -> https://community.theforeman.org/t/update-for-vmware-hardware-version/37242 and the coresponding PR for the fix as well -> https://github.com/theforeman/foreman/pull/10090/files