BLD: explicitly require wheel as a buildtime dependency

[neutrinoceros]

This prevents warnings from pip:

Run python -m pip install --editable "."
Obtaining file:///home/runner/work/ewah_bool_utils/ewah_bool_utils
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  WARNING: Missing build requirements in pyproject.toml for file:///home/runner/work/ewah_bool_utils/ewah_bool_utils.
  WARNING: The project does not specify a build backend, and pip cannot fall back to setuptools without 'wheel'.