Klaus

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This is the last release to support Python 2.

- 312: Repo page: if no default branch is found, use HEAD (Jonas Haag)
- 311: Fix repo access race condition (Jonas Haag)
- 310: Fix slow repo_list with many refs (Jonas Haag)
- 306, 313: Fix encoding issues (Jelmer Vernooij)
- 304: Docker image: Fix ownership issue with Git 2.36+ (Jonas Haag)

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- 292: Fix 500 error when accessing history of blob objects (Jelmer Vernooij)
- 293, 294: Handle SymrefLoop (Jelmer Vernooij)
- 294: Add 'main' to the list of default branch names to try (Jelmer Vernooij)
- Update description on PyPI

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(Broken release)

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- Remove `bin/klaus` and make it a `console_script` entrypoint instead (Jonas Haag)
- Search in repo list (Jonas Haag)
- Repo namespaces (only exposed in `make_app()` for now) (Jonas Haag)
- 253, 274, 287: Python 2.7 fixes (Jelmer Vernooij, Jonas Haag)
- 269, 280: README handling fixes (Ariana Giroux, Jelmer Vernooij, Sol Bekic)
- 268, 270, 281, 285, 286, 283: Various bug fixes (Jelmer Vernooij, Sol Bekic, Wessel Dankers)
- Drop `six` dependency (Jonas Haag)

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- 247: Fix import (Marc Schwab)

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- Test release to check Docker pipeline. No changes.