Update typing-extensions version to be compatible with Pydantic

[ketphan02]

The dependency of typing-extensions has prevented a few people from using the project alongside Pydantic. From v2.0 (Release on 2023-06-30), Pydantic requires typing-extensions>=4.6.1 (reference).

This PR only aims to match the 4.6.1 requirement of Pydantic.

Partially solve #211

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[ketphan02]

@lizgzil Can you please take a look at this one? Thank you!

[lizgzil]

thanks for this @ketphan02 ! I will approve. This huge refactor is on the horizon - in which we have pydantic = "^2.7.1" so I hope this won't be an issue for that. Do let me know if you think otherwise?