v0.22.8

chore: bump version to 0.22.8 (#337)

## Summary
- bump workspace and Python package versions to 0.22.8
- refresh Cargo.lock package versions for workspace crates

## Tests
- cargo metadata --locked --no-deps
- uv run --no-project python -c "import pathlib, tomllib;
p=tomllib.loads(pathlib.Path('python/pyproject.toml').read_text());
assert p['project']['version']=='0.22.8'; assert
p['tool']['commitizen']['version']=='0.22.8'; print('python metadata
version ok')"
- pre-commit hooks during commit, including cargo test --release