refenv / cijoe / 25430272912

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ci: drop Python 3.9 support

cijoe's documented install path is pipx, and pipx-shared pip now uses
3.10+ syntax ('@dataclass(slots=True)'). Any user installing cijoe under
3.9 hits:

    TypeError: dataclass() got an unexpected keyword argument 'slots'

We can't honestly claim 3.9 support when the install path is broken
there, so drop it:

- pyproject.toml: requires-python = ">=3.10"
- CI test matrix: 3.10-3.13 (was 3.9-3.12)
- Publish job: 3.10 (was 3.9)

Python 3.9 reached EOL in October 2025; this aligns with upstream.

Signed-off-by: Simon A. F. Lund <os@safl.dk>

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