chore(deps): update dependency tiktoken to v0.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tiktoken (changelog)	==0.5.2 -> ==0.6.0

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Release Notes

openai/tiktoken (tiktoken)

### [`v0.6.0`](https://togithub.com/openai/tiktoken/blob/HEAD/CHANGELOG.md#v060) [Compare Source](https://togithub.com/openai/tiktoken/compare/0.5.2...0.6.0) - Optimise regular expressions for a 20% performance improvement, thanks to [@​paplorinc](https://togithub.com/paplorinc)! - Add `text-embedding-3-*` models to `encoding_for_model` - Check content hash for downloaded files - Allow pickling `Encoding` objects. Registered `Encoding` will be pickled by reference - Workaround PyO3 bug for frozenset conversion Thank you to [@​paplorinc](https://togithub.com/paplorinc), [@​mdwelsh](https://togithub.com/mdwelsh), [@​Praneet460](https://togithub.com/Praneet460)!

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