Suppress "WARNING: Invalid HTTP request received." warning

The following log may be recorded in the Application log output to CloudWatch Logs when the AgentCore runtime starts up.
When recorded during initialization after deployment, this is a message that does not affect the application. However, this could confuse users, so I would like to suppress it.

For example, you can confirm this log message by adding a lifespan to [strands_claude.py](https://github.com/awslabs/amazon-bedrock-agentcore-samples/blob/f50712e3474939965cff165a8cb60980b1d636d9/01-tutorials/01-AgentCore-runtime/01-hosting-agent/01-strands-with-bedrock-model/runtime_with_strands_and_bedrock_models.ipynb) as follows:

```
from contextlib import asynccontextmanager
from typing import AsyncGenerator

from strands import Agent, tool
from strands_tools import calculator # Import the calculator tool
import argparse
import json
from bedrock_agentcore.runtime import BedrockAgentCoreApp
from strands.models import BedrockModel

@asynccontextmanager
async def lifespan(_app: BedrockAgentCoreApp) -> AsyncGenerator[None, None]:
"""Completely empty lifespan context manager for testing."""
yield
app = BedrockAgentCoreApp(lifespan=lifespan)

# Create a custom tool
@tool
def weather():
""" Get weather """ # Dummy implementation
return "sunny"
(snip)
```