Adjust `create_cluster_specs` argument type
Adjust `create_cluster_specs` argument type

PiperOrigin-RevId: 397295570
Change-Id: I7351883acc6732ef882bbafce37e07134c673ee1
GitOrigin-RevId: c5f340e5132f4efecfa686cf168ed2048a777a4d

deepmind/xmanager,deepmind/xmanager