prism: mark as failing CI

Inside docker, the installer fails with

CustomAction +PrismSearchPlugin.dll.x64 returned actual error code
-2147024770 (note this may not be 100% accurate if translation happened
    inside sandbox)
MSI (s) (18:40) [13:20:35:946]: Product: GraphPad Prism 10.4.1.627 --
Error 1904. Module C:\Program
Files\GraphPad\Prism\PrismSearchPlugin64.dll failed to register.
HRESULT -2147024770.  Contact your support personnel.

but the installation is confirmed to behave correctly outside of docker.