Refresh SourceHut CI manifests (#1213)

Remove reference to obsolete pkg_resources

make: remove non-existent target

Mark unused variables as such

cli/discover: add implicit config to pair for collection creation

Add changelog entry for latest commits

fix: remove unused import

fix: fix ssl behavior in `request`

http: refactor auth loop

http: retry safe DAV methods on transient aiohttp disconnects; cli: gather with return_exceptions to allow in-flight backoffs to finish

ci: run ruff and mypy

Fix some mypy type failures

make: install check requirements via install-dev

Merge docs-requirements.txt into pyproject.toml

Organise imports