chore(deps): update dependency tiktoken to v0.7.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tiktoken (changelog)	==0.6.0 -> ==0.7.0

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Release Notes

openai/tiktoken (tiktoken)

### [`v0.7.0`](https://togithub.com/openai/tiktoken/blob/HEAD/CHANGELOG.md#v070) [Compare Source](https://togithub.com/openai/tiktoken/compare/0.6.0...0.7.0) - Support for `gpt-4o` - Performance improvements

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