Support python 3.13 for python template

[leehuwuj]

Only pipecone and qdrant vector stores do not support python 3.13 right now:

llama-index-vector-stores-qdrant requires Python < 3.13,>=3.9
llama-index-vector-stores-pinecone requires Python < 3.13,>=3.8.1

Keep track of those packages to support Python template with 3.13 once they're working.

Note:
Only need to update the Python version in the pyproject.toml file in the template and check if the tests are all passed.

Ref: #304