taskell: fix test failure for sonoma builds

[chenrui333]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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• Tracking issue for Sonoma bottling #142161 (comment)
• https://github.com/smallhadroncollider/taskell/issues/114

[chenrui333]

still the same issue

  ==> /opt/homebrew/Cellar/taskell/1.11.4/bin/taskell -i test.md
  taskell: /private/tmp/taskell-test-20231201-31879-ifd2me/.config/taskell/config.ini: hGetContents: invalid argument (invalid byte sequence)
  
  Error: taskell: failed
  An exception occurred within a child process:
    Minitest::Assertion: Expected: 0
    Actual: 1

[chenrui333]

close for now.