[bug] litellm support erroring for azure openai falling through to the openai callable

[dtam]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

from guardrails import Guard
import os
os.environ["AZURE_API_KEY"] = "" # "my-azure-api-key"
os.environ["AZURE_API_BASE"] = "" # "https://example-endpoint.openai.azure.com"
os.environ["AZURE_API_VERSION"] = "" # "2023-05-15"

guard = Guard()

result = guard(
    model="azure/<your_deployment_name>",
    messages=[{"role":"user", "content":"How many moons does Jupiter have?"}],
)

print(f"{result.validated_output}")

Expected behavior
uses litellm

Library version:
Version (e.g. 0.5.0)

Additional context
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[dtam]

this was fixed with #958