Apply swh-py-template v0.3.3 with copier

Jenkins job DLS/gitlab-builds #443 succeeded in 4 min 16 sec.
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added 3 commits

• edef3b85 - Apply swh-py-template v0.3.3 with copier
• 4b3a12fe - maven, sourceforge: Fix mypy errors
• db00f23e - save_bulk/test_lister: Fix flake8 warnings

Compare with previous version

Jenkins job DLS/gitlab-builds #444 succeeded in 6 min 52 sec.
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merged manually