patatt v0.7.1 released

Hi, all:

A small bump release for patatt with a few fixes:

- Fix user.signingkey handling for SSH keys by checking gpg.format to
  determine the key type, instead of always assuming OpenPGP.
- Make install-hook work correctly in git submodules by using
  git rev-parse --git-dir instead of assuming .git
- Fix compatibility with Python versions before 3.13
- Fix typo in package classifier metadata.

Thanks:

- Bingwu Zhang
- Uwe Kleine-König

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KR