Update Rust crate tiktoken-rs to 0.6.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
tiktoken-rs	workspace.dependencies	minor	0.5.9 -> 0.6.0

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Release Notes

zurawiki/tiktoken-rs (tiktoken-rs)

v0.6.0

Compare Source

Minor version release signifies a breaking change in 0.x

What's Changed

• Add support for chatgpt-4o-latest by @​Congyuwang in https://github.com/zurawiki/tiktoken-rs/pull/85
• Refactor internals to make future updates to tiktoken easier to merge
• Do not expose tiktoken internal modules and functions
• Update dependencies

New Contributors

• @​Congyuwang made their first contribution in https://github.com/zurawiki/tiktoken-rs/pull/85

Full Changelog: zurawiki/tiktoken-rs@v0.5.9...v0.6.0

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Release Notes:

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