Bug#1050993: podman: Podman should use overlay storage driver by default instead of vfs

[Gregor Riepl]

As mentioned in the upstream bug report[1], the fix is actually in 
containers/storage 1.48, included with podman 4.6 and not 4.5.

So, the bug can (hopefully) be fixed for good when this version is packaged.
It might also be helpful to include a what's new message, to make users 
aware they need to reset their storage after upgrading. There doesn't 
seem to be an easy way to convert vfs containers or images to overlay.

[1] 
https://github.com/containers/podman/issues/19811#issuecomment-1716344802