Log Message:
py-bitarray: updated to 2.7.3

2.7.3:
* fix popcount64 name conflict on NetBSD
* even though PyPy is not actively supported, allow running tests for
  PyPy 3.7 and 3.8
* 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
* improve testing