Update utils.py- Fix error when using AzureOpenAI services #1783

Job	Run time
format	19s
lint	31s
mypy (./packages/autogen-core)	1m 18s
mypy (./packages/autogen-magentic-one)	45s
check-proto-changes-python	36s
docs (./packages/autogen-core)	47s
mypy (./packages/agbench)	33s
mypy (./packages/autogen-ext)	53s
docs-example-check (./packages/autogen-core)	1m 24s
mypy (./packages/autogen-agentchat)	32s
pyright (./packages/autogen-core)	29s
pyright (./packages/autogen-magentic-one)	27s
pyright (./packages/agbench)	28s
test (./packages/autogen-core)	48s
pyright (./packages/autogen-ext)	29s
test (./packages/autogen-magentic-one)	56s
pyright (./packages/autogen-agentchat)	24s
test (./packages/autogen-ext)	1m 3s
test (./packages/autogen-agentchat)	28s
	13m 10s

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