Handle tiktoken for newer OpenAI models in studypal example

[sanjeed5]

Please describe the changes in your PR. If it is addressing an issue, please reference that as well.

[markbackman]

Thanks for the submission! This generally looks good. If you can remove the LLM model env var and arg all together, I think this is good to go.

[codecov[bot]]

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[markbackman]

@sanjeed5 pinging about my previous comment so we can get this merged.

[aconchillo]

Closing. The studypal example has been moved here: https://github.com/pipecat-ai/pipecat-examples/tree/main/studypal. Please, submit a PR there if this is still relevant. :pray: