revert: "feat(simulator.repos): major update tier4/scenario_simulator_v2 to 16.3.2" (#6152)

This reverts commit 91dbde4.

Signed-off-by: Ryohsuke Mitsudome <ryohsuke.mitsudome@tier4.jp>

Author: mitsudome-r

simulator.repos

@@ -2,4 +2,4 @@ repositories:
   simulator/scenario_simulator:
     type: git
     url: https://github.com/tier4/scenario_simulator_v2.git
-    version: 16.3.2
+    version: 15.1.1