chore(deps): update dependency tiktoken to v0.9.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tiktoken (changelog)	==0.7.0 -> ==0.9.0

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Release Notes

openai/tiktoken (tiktoken)

v0.9.0

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• Support for o1 and o3 models
• Better error messages when loading invalid vocabulary files
• Support for encoding to numpy arrays
• Delayed imports when not strictly necessary

v0.8.0

Compare Source

• Support for o1- and chatgpt-4o- models
• Build wheels for Python 3.13
• Add possessive quantifiers to limit backtracking in regular expressions, thanks to @​l0rinc!
• Provide a better error message and type for invalid token decode
• Permit tuples in type hints
• Better error message for passing invalid input to get_encoding
• Better error messages during plugin loading
• Add a __version__ attribute
• Update versions of pyo3, regex, fancy-regex
• Drop support for Python 3.8

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