build(deps): bump bitarray from 3.9.0 to 3.9.1

[dependabot]

Bumps bitarray from 3.9.0 to 3.9.1.

Changelog

Sourced from bitarray's changelog.

Change log

3.9.1 (2026-07-19):

• improving free-threading readiness, see also [#251](https://github.com/ilanschnell/bitarray/issues/251) <https://github.com/ilanschnell/bitarray/issues/251>__:
  • initialize tables at module import, not lazily
  • remove caching imported Python objects (which are already caches)
  • added 75 critial sections in Python-facing operations
  • updated Trove Classifier to Free Threading :: 2 - Beta
• clip arguments in .bytereverse() instead of raising IndexError
• remove ssize_richcompare() in favor of Py_RETURN_RICHCOMPARE macro
• add tests for frozenbitarrays created by methods when self is a frozenbitarray, e.g. slicing a frozenbitarray

3.9.0 (2026-07-10):

• add .rotate() method, rotate bitarray in-place by k positions
• expose the decodeiterator class, and add .skipbits() method as well as .index data descriptor, see [#252](https://github.com/ilanschnell/bitarray/issues/252) <https://github.com/ilanschnell/bitarray/issues/252>__
• fix random_p() silently producing all-zero bitarrays for small n when p=float("nan")
• improve integer argument handling in util.random_k(), util.gen_primes(), util.pprint() and util.int2ba()
• add python_requires >= 3.7 to package metadata
• improve testing - use more of unittest's functionality
• add Rule 90 example <../examples/rule90.py>__

3.8.2 (2026-06-17):

• clarity/wording improvements throughout project
• add new_allocation() to simplify resize()
• drop Python 3.6 support

3.8.1 (2026-04-02):

• fixed critial findings in C Extension Analysis Report, see [#250](https://github.com/ilanschnell/bitarray/issues/250) <https://github.com/ilanschnell/bitarray/issues/250>__
• add tests, in particular devel/test_capi.py

3.8.0 (2025-11-02):

• add experimental support for free-threaded builds (GIL disabled), [#234](https://github.com/ilanschnell/bitarray/issues/234) <https://github.com/ilanschnell/bitarray/issues/234>__
• remove _set_default_endian()
• add .__bytes__(), see [#246](https://github.com/ilanschnell/bitarray/issues/246) <https://github.com/ilanschnell/bitarray/issues/246>__

... (truncated)

Commits

• 2f9ee5c add release date - update docs
• c7df6b5 add free-threading safety for vl_encode()
• a2f8b50 add comments
• 7a13604 move output buffer allocation and final resize out of critical section
• 34676de add lock to sc_encode()
• 5f9c0e6 naming
• 1c036d9 free-threading safety for binary functions - improve count_n()
• 0d6e6dd make .pack() free-threading safe, and improve bitarray_concat()
• 6627d78 make shift operations free-threading safe
• 32afe01 make bitwise operations free-threading safe
• Additional commits viewable in compare view

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[github-actions]

👋 Hello! Thanks for your contribution. We will review this and get back to you as soon as possible. — th30d4y