chore(deps): update dependency traitlets to v5.15.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
traitlets	==5.14.3 → ==5.15.1

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Release Notes

ipython/traitlets (traitlets)

v5.15.1

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Maintenance and upkeep improvements

• Fix CI (docs build, mypy tests, downstream) #​943 (@​Carreau, @​krassowski)

Contributors to this release

The following people contributed discussions, new ideas, code and documentation contributions, and review.
See our definition of contributors.

(GitHub contributors page for this release)

@​Carreau (activity) | @​krassowski (activity) | @​rmorshea (activity)

v5.15.0

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Enhancements made

• Moved definitions of K and V outside of TYPE_CHECKING condition #​935 (@​JohanMabille, @​Carreau)
• Accept integer-valued numbers for Integer #​919 (@​minrk, @​ivanov)
• Update __new__ method to use Self type for improved type hinting #​918 (@​fleming79, @​minrk)
• Fix whitespace formatting in CLI help. #​917 (@​Carreau, @​minrk)

Bugs fixed

• Fix traitlets.__all__ #​933 (@​kylebarron, @​minrk)
• The --config option with absolute paths will be loaded only once. #​923 (@​ryumasai, @​minrk)
• Avoid using return t.cast which can prevent attribute access during process teardown #​913 (@​minrk, @​Carreau)
• Suppress exceptions when closing handlers during __del__ #​912 (@​minrk, @​Carreau)

Maintenance and upkeep improvements

• Removed pinning on virtualenv #​939 (@​JohanMabille)
• Pin virtualenv<21 in tests because of breaking change incompatible wi… #​937 (@​JohanMabille, @​SylvainCorlay)
• Added upper bound to mypy on pypy #​936 (@​JohanMabille, @​Carreau)
• Start testing on 3.14 and 3.14t #​929 (@​Carreau)
• Require Python 3.9 (drop 3.8) #​924 (@​minrk)
• Deprecate empty isidentifier utility #​915 (@​minrk, @​Carreau)
• Fix downstream test package_spec #​914 (@​minrk)
• CI: Start testing on Python 3.13 #​910 (@​EwoutH, @​minrk)
• Remove py2-compat hack from bunch.__dir__ #​906 (@​sethtroisi, @​minrk)

Documentation improvements

• Use extension:filetype mapping in sphinx configuration #​928 (@​Carreau)

Contributors to this release

The following people contributed discussions, new ideas, code and documentation contributions, and review.
See our definition of contributors.

(GitHub contributors page for this release)

@​Carreau (activity) | @​EwoutH (activity) | @​fleming79 (activity) | @​ivanov (activity) | @​JohanMabille (activity) | @​kylebarron (activity) | @​minrk (activity) | @​ryumasai (activity) | @​sethtroisi (activity) | @​SylvainCorlay (activity)

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[Gui-FernandesBR]

Closing: this PR edits the autogenerated docs/requirements.txt directly (compiled from docs/requirements.in). Renovate's config is being corrected in #1039 — the pip-compile manager will regenerate this file, and pip_requirements is disabled for it, so these line-by-line PRs won't be recreated.

[renovate]

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