bump containerd/cgroups 4994991857f9b0ae8dc439551e8bebdbb4bf66c1

full diff: dbea6f2bd4...4994991857

brings in https://github.com/containerd/cgroups/pull/79 Return ErrCgroupDeleted when no subsystems
fixes https://github.com/containerd/containerd/issues/3133 Custom cgroup path does not work in containerd 1.2.5

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/containerd/cgroups/cgroup.go

@@ -105,6 +105,10 @@ func Load(hierarchy Hierarchy, path Path, opts ...InitOpts) (Cgroup, error) {
 		}
 		activeSubsystems = append(activeSubsystems, s)
 	}
+	// if we do not have any active systems then the cgroup is deleted
+	if len(activeSubsystems) == 0 {
+		return nil, ErrCgroupDeleted
+	}
 	return &cgroup{
 		path:       path,
 		subsystems: activeSubsystems,