It is impossible to alter `min_ram` using an `UpdateImageProperty` [struct](https://github.com/gophercloud/gophercloud/blob/c021acc4ae8c6d7cc22843f56e45f379a895b7c6/openstack/imageservice/v2/images/requests.go#L347..L352), since it's value is a string, but `min_ram` must be an integer. https://github.com/openstack/glance/blob/0a29d31c1322462ff50ec20aff3c3ffb3bdf37c5/glance/api/v2/images.py#L1310..L1318