Add tiktoken as a dependency in pyproject.toml

[JohanForngren]

Why are these changes needed?

Adding missing dependency tiktoken.

Related issue number

Closes #5007

Checks

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[victordibia]

Hi @JohanForngren ,

Thanks for this fix.
Now that I look at it, tiktoken should be installed with autogen_ext[openai] extra. I see that the dependencies have been separated and now we need to add an additional extra flag to that to ensure things install correctly ...

"autogen-ext[magentic-one, openai, azure]==0.4.0"

This will install dependencies that we do need in Studio . See here

azure = ["azure-core", "azure-identity"]
docker = ["docker~=7.0"]
openai = ["openai>=1.52.2", "tiktoken>=0.8.0", "aiofiles"]

Do you mind updating your fix to just modify the extras on autogen ext? ie this

"autogen-ext[magentic-one, openai, azure]==0.4.0"

Thanks again for testing and proposing this fix!
I'll merge in once updated