Fix simulation error caused by Pydantic version in Ray (#2002)

pyproject.toml

@@ -59,14 +59,15 @@ importlib-metadata = { version = "^4.0.0", markers = "python_version < '3.8'" }
 iterators = "^0.0.2"
 # Optional dependencies (VCE)
 ray = { version = "==2.5.1", extras = ["default"], optional = true }
+pydantic = { version = "<2.0.0", optional = true }
 # Optional dependencies (REST transport layer)
 requests = { version = "^2.28.2", optional = true }
 fastapi = { version = "^0.95.0", optional = true }
 starlette = { version = "^0.27.0", optional = true }
 uvicorn = { version = "^0.21.1", extras = ["standard"], optional = true }
 
 [tool.poetry.extras]
-simulation = ["ray"]
+simulation = ["ray", "pydantic"]
 rest = ["fastapi", "requests", "starlette", "uvicorn"]
 
 [tool.poetry.group.dev.dependencies]