EncodingWarning when PYTHONWARNDEFAULTENCODING

[jaraco]

  /Users/jaraco/code/jaraco/jaraco.net/.tox/python/lib/python3.11/site-packages/build/env.py:201: EncodingWarning: 'encoding' argument not specified
    with tempfile.NamedTemporaryFile('w+', prefix='build-reqs-', suffix='.txt', delete=False) as req_file:

[jaraco]

I'm still getting these warnings.