Update to 0.10.3:

  - refactor: rearrange the project to the src/ layout (https://todo.sr.ht/~mcepl/pygn/7)
    - Fix also pyproject.toml to generate what seems right.
    - Add the explicit dependency on nntplib for Python >= 3.12 (gh#python/cpython!104894).
  - Use email.policy.SMTP to be perfectly conforming with RFCs.
    Perhaps fixes: https://todo.sr.ht/~mcepl/pygn/6
  - Rename README to README.md
  - Switch hosting of the project to Sourcehut.
  - Also add the text of GPLv3.
  - When sending nntp message fails, log the message to temporary file.
  - Convert documentation from .maff to plain HTML.
  - Parse email messages from binary files (Fixes #24 on GitLab)
    (see also gh#python/cpython#69731 and gh#python/cpython#85479)
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