Upgrade nbformat and runtimelib (#20050)

Fixes an issue on load of notebooks that have `text/*` output in
`Vec<String>` rather than `String`. This ensures that Markdown output
will render correctly.

<img width="1306" alt="image"
src="https://github.com/user-attachments/assets/0bcc7dc8-527f-4067-a916-3ae569ea197d">


Release Notes:

- N/A