Xbootstrap

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- Move to pyproject.toml (:pull:`13`)
- Update test and build workflows (:pull:`13`)
- Switch to ruff for code linting (:pull:`13`)
- Drop Python 3.8 from CI tests, add Python 3.11 (:pull:`13`)
- Fix bug when there is a single dask-backed object that is chunked
in a way that means it is processed in pieces within xbootstrap
(:issue:`7`, :pull:`8`)

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- Return xarray object rather than tuple for single input object
(:issue:`4`, :pull:`6`)
- Make circular bootstrapping optional (:issue:`2`, :pull:`5`)

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- Initial release on PyPI