fix(deps): update dependency tiktoken to ^0.14.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
tiktoken (changelog)	^0.9.0 → ^0.14.0

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Release Notes

openai/tiktoken (tiktoken)

v0.14.0

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• Build wheels for Python 3.15
• Support looking up more GPT-5 series models
• Upgrade dependencies

v0.13.0

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• Update fancy-regex for significantly increased performance
• Branch byte pair encoding to fix performance on unusual input
• Fix AttributeError caused by incomplete redaction of experimental code
• Update version of pyo3
• Update version of optional dependency blobfile

v0.12.0

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• Build wheels for Python 3.14
• Build musllinux aarch64 wheels
• Support for free-threaded Python
• Update version of pyo3 and rustc-hash
• Avoid use of blobfile for reading local files
• Recognise gpt-5 model identifier
• Minor performance improvement for file reading

v0.11.0

• Support for GPT-5
• Update version of pyo3
• Use new Rust edition
• Fix special token handling in encode_to_numpy
• Better error handling
• Improvements to private APIs

v0.10.0

• Support for newer models
• Improvements to private APIs

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