Update Milvus & Zilliz Cloud demos for latest release (#13483)

docs/docs/examples/managed/zcpDemo.ipynb

docs/docs/examples/vector_stores/MilvusIndexDemo.ipynb

...managed-zilliz/llama_index/indices/managed/zilliz/base.py

...indices/llama-index-indices-managed-zilliz/pyproject.toml

...or-stores-milvus/llama_index/vector_stores/milvus/base.py

...or_stores/llama-index-vector-stores-milvus/pyproject.toml