change universe params

Signed-off-by: Yuki Takagi <yuki.takagi@tier4.jp>

planning/obstacle_cruise_planner/config/obstacle_cruise_planner.param.yaml

@@ -222,5 +222,5 @@
           sudden_object_acc_threshold: -1.1 # If a stop can be achieved by a deceleration smaller than this value, it is not considered as “sudden stop".
           sudden_object_dist_threshold: 1000.0 # If a stop distance is longer than this value, it is not considered as “sudden stop".
           abandon_to_stop: false # If true, the planner gives up to stop when it cannot avoid to run over while maintaining the deceleration limit.
-      limit_margin_for_unknown: 3.0
-      preferred_acc_for_unknown: -3.0
+      limit_margin_for_unknown: 6.0
+      preferred_acc_for_unknown: -6.0