Bump bitarray from 1.5.3 to 2.7.3 in /requirements

[dependabot]

Bumps bitarray from 1.5.3 to 2.7.3.

Changelog

Sourced from bitarray's changelog.

Change log

2.7.3 (2023-02-20):

• fix popcount64 name conflict on NetBSD, [#189](https://github.com/ilanschnell/bitarray/issues/189) <https://github.com/ilanschnell/bitarray/issues/189>__
• even though PyPy is not actively supported, allow running tests for PyPy 3.7 and 3.8, see also [#188](https://github.com/ilanschnell/bitarray/issues/188) <https://github.com/ilanschnell/bitarray/issues/188>__
• allow running python setup.py test
• add official Python 3.12 support
• simplify count functionality in util module
• retire bitcount_lookup[256] table
• improve util.count_n() error messages
• avoid util module tests from being run more than once in each call to bitarray.test() when called multiple times in the same Python process, see #6e52e49a <https://github.com/ilanschnell/bitarray/commit/6e52e49a>__
• improve testing

2.7.2 (2023-02-12):

• speedup all count functionality by using __builtin_popcountll when available, see [#187](https://github.com/ilanschnell/bitarray/issues/187) <https://github.com/ilanschnell/bitarray/issues/187>__
• add popcount64() to bitarray.h - we assume now that uint64_t is always available
• improve testing

2.7.1 (2023-02-10):

• optimize util.sc_encode()

2.7.0 (2023-02-05):

• add util.sc_encode() and util.sc_decode() for compression of sparse bitarrays <sparse_compression.rst>__
• add util.any_and()
• add util.intervals()
• move functionality of the following utility functions entirely to C: hex2ba(), base2ba(), deserialize(), vl_decode(), zeros()
• improve error checking for unpickling
• add distance metrics <../examples/distance.py>__ example: dice, hamming, jaccard, kulczynski1, rogerstanimoto, russellrao, sokalmichener, sokalsneath, yule
• add example sparse bitarray <../examples/sparse>__ implementations

2.6.2 (2023-01-01):

... (truncated)

Commits

• ddbf75b add release date - update docs
• 9fdee1a allow running python setup.py test
• c991d40 add missing quote
• 707a7d3 exit when trying to run python setup.py test
• 58f68e2 more consistent naming for population count of words
• c3f4b48 improve test_encode_zeros
• 25a631b update changelog
• d8ce774 rename popcount64() -> popcnt_64(), fix issue #189
• 2db5357 add link to changelog - more consistent naming
• 6e52e49 avoid util module tests from being run more than once in each call to bitarra...
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