fix(deps): update dependency tiktoken to ~=0.13.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
tiktoken (changelog)	~=0.11.0 → ~=0.13.0

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Release Notes

openai/tiktoken (tiktoken)

v0.13.0

Compare Source

• 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

Compare Source

• 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

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