Revert "Update runc to 1.0.0"

vendor/github.com/opencontainers/runc/libcontainer/cgroups/systemd/dbus.go

@@ -17,16 +17,14 @@ var (
 	dbusRootless bool
 )
 
-type dbusConnManager struct{}
+type dbusConnManager struct {
+}
 
 // newDbusConnManager initializes systemd dbus connection manager.
 func newDbusConnManager(rootless bool) *dbusConnManager {
-	dbusMu.Lock()
-	defer dbusMu.Unlock()
 	if dbusInited && rootless != dbusRootless {
 		panic("can't have both root and rootless dbus")
 	}
-	dbusInited = true
 	dbusRootless = rootless
 	return &dbusConnManager{}
 }