remove litellm install #289

Job	Run time
adk-py / test	16s
langchain-py (3.10, windows-latest) / test	58s
build (3.13, windows-latest, 1)	13m 1s
build (3.10, windows-latest, 0)	10m 50s
build (3.10, ubuntu-latest, 1)	6m 44s
build (3.13, ubuntu-latest, 0)	5m 33s
build (3.11, windows-latest, 1)	12m 11s
build (3.12, windows-latest, 0)	11m 19s
build (3.14, windows-latest, 1)	11m 10s
langchain-py (3.13, ubuntu-latest) / test	25s
langchain-py (3.11, windows-latest) / test	57s
build (3.12, ubuntu-latest, 1)	6m 25s
build (3.11, windows-latest, 0)	9m 30s
build (3.13, windows-latest, 0)	10m 8s
build (3.14, windows-latest, 0)	10m 49s
build (3.10, ubuntu-latest, 0)	5m 25s
build (3.10, windows-latest, 1)	12m 31s
langchain-py (3.12, ubuntu-latest) / test	23s
build (3.12, windows-latest, 1)	12m 23s
build (3.11, ubuntu-latest, 1)	6m 24s
build (3.13, ubuntu-latest, 1)	6m 46s
build (3.11, ubuntu-latest, 0)	5m 33s
build (3.12, ubuntu-latest, 0)	5m 46s
build (3.14, ubuntu-latest, 0)	5m 43s
langchain-py (3.13, windows-latest) / test	1m 9s
build (3.14, ubuntu-latest, 1)	6m 58s
langchain-py (3.11, ubuntu-latest) / test	26s
langchain-py (3.10, ubuntu-latest) / test	19s
langchain-py (3.12, windows-latest) / test	1m 1s
upload-wheel	20s
	3h 1m 23s

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