infra[patch]: update notebooks workflow (#26956)

Addressing some lingering comments from
https://github.com/langchain-ai/langchain/pull/26944, adding parameters
for
- python version
- working directory

![Screenshot 2024-09-27 at 3 33
21 PM](https://github.com/user-attachments/assets/dfa45772-fddb-4489-a148-c9ed83d844d0)