update prefabs

Project/Assets/ML-Agents/Examples/SharedAssets/Prefabs/PlatformDynamicTarget.prefab

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Project/Assets/ML-Agents/Examples/Walker/Prefabs/Platforms/PlatformWalkerDynamicSingleSpeed.prefab

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Project/Assets/ML-Agents/Examples/Walker/Prefabs/Ragdoll/WalkerRagdollDySingleSpeedVariant.prefab

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config/ppo/WalkerDynamicVariableSpeed.yaml

         strength: 1.0
     keep_checkpoints: 5
     max_steps: 30000000
-    time_horizon: 256 #1000
+    time_horizon: 1000
     summary_freq: 30000
     threaded: true