Update starlette version >= 0.49.1 to fix vulnerability (#1495)

Author: tgasser-nv

poetry.lock

@@ -67,7 +67,7 @@ pydantic = ">=1.10"
 pyyaml = ">=6.0"
 rich = ">=13.5.2"
 simpleeval = ">=0.9.13,"
-starlette = ">=0.27.0"
+starlette = ">=0.49.1"
 typer = ">=0.8"
 uvicorn = ">=0.23"
 watchdog = ">=3.0.0,"
@@ -167,8 +167,8 @@ include = [
   "tests/test_callbacks.py",
 ]
 exclude = [
-    "nemoguardrails/llm/providers/trtllm/**",
-    "nemoguardrails/llm/providers/_langchain_nvidia_ai_endpoints_patch.py"
+  "nemoguardrails/llm/providers/trtllm/**",
+  "nemoguardrails/llm/providers/_langchain_nvidia_ai_endpoints_patch.py",
 ]
 
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