Bump bitarray from 3.8.0 to 3.8.1 in /requirements

[dependabot]

Bumps bitarray from 3.8.0 to 3.8.1.

Changelog

Sourced from bitarray's changelog.

Change log

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>__

3.7.2 (2025-10-08):

• enable util.random_k() for all supported Python versions, previously this functions required Python 3.9 or higher
• add official Python 3.14 support
• update cibuildwheel to 3.2.0

3.7.1 (2025-08-28):

• fix type hinting for memoryviews, see [#241](https://github.com/ilanschnell/bitarray/issues/241) <https://github.com/ilanschnell/bitarray/issues/241>__
• add bit-endianness <endianness.rst>__ documentation
• improve testing, including debug mode test for digit_to_int()

3.7.0 (2025-08-24):

• add util.gen_primes(), generate bitarrays in which active indices are prime numbers
• improve .buffer_info() to return named tuple
• add optional mode argument to util.sum_indices() to sum square of active indices
• improve internal _sysinfo() to include Py_DEBUG
• add Dubner's conjecture <../examples/dubner.rst>__ (in memory of Harvey Dubner)
• add dynamically growing sieve <../examples/dyn_sieve.py>__

3.6.1 (2025-08-12):

• add development files for statistical tests in devel/random/
• optimize util.sum_indices()
• fix RecursionError in util.random_k(), see [#239](https://github.com/ilanschnell/bitarray/issues/239) <https://github.com/ilanschnell/bitarray/issues/239>__
• add devel/test_sum_indices.py

... (truncated)

Commits

• 10ebd4b add release date - update docs
• e4dfd4f update test output
• dc1c47e update changelog
• e1381ad check PyLong_FromLong return values - see #250 finding 8
• 98f4a32 fix memory leak in binode_to_dict() when resize fails - see #250 finding 11
• cdaf106 improve error handling in bitarray_buffer_info() - see #250 finding 12
• dba5f28 move PyObject_GC_UnTrack() to the top of decodeiter_dealloc(), to match other...
• 7480c4e add sanity checks in devel-test
• c4aa327 add missing Py_VISIT(it->sub) in searchiter_traverse
• 334e2dc add development tests which import _testcapi
• Additional commits viewable in compare view

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